diff --git a/package-lock.json b/package-lock.json
index c68adc0..0889a19 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "febu",
-  "version": "0.18.2",
+  "version": "0.18.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -493,7 +493,8 @@
     "base64-js": {
       "version": "0.0.8",
       "resolved": "http://registry.npm.taobao.org/base64-js/download/base64-js-0.0.8.tgz",
-      "integrity": "sha1-EQHpVE9KdrG8OybUUsqW16NeeXg="
+      "integrity": "sha1-EQHpVE9KdrG8OybUUsqW16NeeXg=",
+      "optional": true
     },
     "bin-build": {
       "version": "3.0.0",
@@ -638,7 +639,7 @@
           "dependencies": {
             "pify": {
               "version": "3.0.0",
-              "resolved": "http://registry.npm.taobao.org/pify/download/pify-3.0.0.tgz",
+              "resolved": "https://registry.npm.taobao.org/pify/download/pify-3.0.0.tgz",
               "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
               "optional": true
             }
@@ -696,6 +697,7 @@
           "version": "2.0.1",
           "resolved": "http://registry.npm.taobao.org/p-timeout/download/p-timeout-2.0.1.tgz",
           "integrity": "sha1-2N0ZeVldLcATnh/ka4tkbLPN8Dg=",
+          "optional": true,
           "requires": {
             "p-finally": "^1.0.0"
           }
@@ -769,7 +771,8 @@
     "boolbase": {
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/boolbase/download/boolbase-1.0.0.tgz",
-      "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24="
+      "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24=",
+      "optional": true
     },
     "brace-expansion": {
       "version": "1.1.8",
@@ -801,6 +804,7 @@
       "version": "3.6.0",
       "resolved": "http://registry.npm.taobao.org/buffer/download/buffer-3.6.0.tgz",
       "integrity": "sha1-pyyTb3e5a/UvX357RnGAYoVR3vs=",
+      "optional": true,
       "requires": {
         "base64-js": "0.0.8",
         "ieee754": "^1.1.4",
@@ -824,7 +828,8 @@
     "buffer-crc32": {
       "version": "0.2.13",
       "resolved": "http://registry.npm.taobao.org/buffer-crc32/download/buffer-crc32-0.2.13.tgz",
-      "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI="
+      "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=",
+      "optional": true
     },
     "buffer-equal": {
       "version": "1.0.0",
@@ -950,6 +955,7 @@
       "version": "2.0.1",
       "resolved": "http://registry.npm.taobao.org/caw/download/caw-2.0.1.tgz",
       "integrity": "sha1-bDygcfwZRyCIPC3F2psHS/x+npU=",
+      "optional": true,
       "requires": {
         "get-proxy": "^2.0.0",
         "isurl": "^1.0.0-alpha5",
@@ -1037,16 +1043,16 @@
     },
     "clean-css": {
       "version": "4.2.1",
-      "resolved": "http://registry.npm.taobao.org/clean-css/download/clean-css-4.2.1.tgz",
-      "integrity": "sha1-LUEe92uFabbQyEBo2r6FsKpeXBc=",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.1.tgz",
+      "integrity": "sha512-4ZxI6dy4lrY6FHzfiy1aEOXgu4LIsW2MhwG0VBKdcoGoH/XLFgaHSdLTGr4O8Be6A8r3MOphEiI8Gc1n0ecf3g==",
       "requires": {
         "source-map": "~0.6.0"
       },
       "dependencies": {
         "source-map": {
           "version": "0.6.1",
-          "resolved": "http://registry.npm.taobao.org/source-map/download/source-map-0.6.1.tgz",
-          "integrity": "sha1-dHIq8y6WFOnCh6jQu95IteLxomM="
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
         }
       }
     },
@@ -1258,6 +1264,7 @@
       "version": "1.1.12",
       "resolved": "http://registry.npm.taobao.org/config-chain/download/config-chain-1.1.12.tgz",
       "integrity": "sha1-D96NCRIA616AjK8l/mGMAvSOTvo=",
+      "optional": true,
       "requires": {
         "ini": "^1.3.4",
         "proto-list": "~1.2.1"
@@ -1272,7 +1279,8 @@
     "content-disposition": {
       "version": "0.5.2",
       "resolved": "http://registry.npm.taobao.org/content-disposition/download/content-disposition-0.5.2.tgz",
-      "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ="
+      "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ=",
+      "optional": true
     },
     "convert-source-map": {
       "version": "1.6.0",
@@ -1440,6 +1448,7 @@
       "version": "4.2.0",
       "resolved": "http://registry.npm.taobao.org/decompress/download/decompress-4.2.0.tgz",
       "integrity": "sha1-eu3YVCflqS2s/lVnSnxQXpbQH50=",
+      "optional": true,
       "requires": {
         "decompress-tar": "^4.0.0",
         "decompress-tarbz2": "^4.0.0",
@@ -1453,8 +1462,9 @@
       "dependencies": {
         "pify": {
           "version": "2.3.0",
-          "resolved": "http://registry.npm.taobao.org/pify/download/pify-2.3.0.tgz",
-          "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw="
+          "resolved": "https://registry.npm.taobao.org/pify/download/pify-2.3.0.tgz",
+          "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
+          "optional": true
         }
       }
     },
@@ -1462,6 +1472,7 @@
       "version": "3.3.0",
       "resolved": "http://registry.npm.taobao.org/decompress-response/download/decompress-response-3.3.0.tgz",
       "integrity": "sha1-gKTdMjdIOEv6JICDYirt7Jgq3/M=",
+      "optional": true,
       "requires": {
         "mimic-response": "^1.0.0"
       }
@@ -1487,6 +1498,7 @@
       "version": "4.1.1",
       "resolved": "http://registry.npm.taobao.org/decompress-tarbz2/download/decompress-tarbz2-4.1.1.tgz",
       "integrity": "sha1-MIKluIDqQEOBY0nzeLVsUWvho5s=",
+      "optional": true,
       "requires": {
         "decompress-tar": "^4.1.0",
         "file-type": "^6.1.0",
@@ -1498,7 +1510,8 @@
         "file-type": {
           "version": "6.2.0",
           "resolved": "http://registry.npm.taobao.org/file-type/download/file-type-6.2.0.tgz",
-          "integrity": "sha1-5QzXXTVv/tTjBtxPW89Sp5kDqRk="
+          "integrity": "sha1-5QzXXTVv/tTjBtxPW89Sp5kDqRk=",
+          "optional": true
         }
       }
     },
@@ -1506,6 +1519,7 @@
       "version": "4.1.1",
       "resolved": "http://registry.npm.taobao.org/decompress-targz/download/decompress-targz-4.1.1.tgz",
       "integrity": "sha1-wJvDXE0R894J8tLaU+neI+fOHu4=",
+      "optional": true,
       "requires": {
         "decompress-tar": "^4.1.1",
         "file-type": "^5.2.0",
@@ -1515,7 +1529,8 @@
         "file-type": {
           "version": "5.2.0",
           "resolved": "http://registry.npm.taobao.org/file-type/download/file-type-5.2.0.tgz",
-          "integrity": "sha1-LdvqfHP/42No365J3DOMBYwritY="
+          "integrity": "sha1-LdvqfHP/42No365J3DOMBYwritY=",
+          "optional": true
         }
       }
     },
@@ -1523,6 +1538,7 @@
       "version": "4.0.1",
       "resolved": "http://registry.npm.taobao.org/decompress-unzip/download/decompress-unzip-4.0.1.tgz",
       "integrity": "sha1-3qrM39FK6vhVePczroIQ+bSEj2k=",
+      "optional": true,
       "requires": {
         "file-type": "^3.8.0",
         "get-stream": "^2.2.0",
@@ -1533,12 +1549,14 @@
         "file-type": {
           "version": "3.9.0",
           "resolved": "http://registry.npm.taobao.org/file-type/download/file-type-3.9.0.tgz",
-          "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek="
+          "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek=",
+          "optional": true
         },
         "get-stream": {
           "version": "2.3.1",
           "resolved": "http://registry.npm.taobao.org/get-stream/download/get-stream-2.3.1.tgz",
           "integrity": "sha1-Xzj5PzRgCWZu4BUKBUFn+Rvdld4=",
+          "optional": true,
           "requires": {
             "object-assign": "^4.0.1",
             "pinkie-promise": "^2.0.0"
@@ -1547,7 +1565,8 @@
         "pify": {
           "version": "2.3.0",
           "resolved": "http://registry.npm.taobao.org/pify/download/pify-2.3.0.tgz",
-          "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw="
+          "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
+          "optional": true
         }
       }
     },
@@ -1761,7 +1780,8 @@
     "duplexer3": {
       "version": "0.1.4",
       "resolved": "http://registry.npm.taobao.org/duplexer3/download/duplexer3-0.1.4.tgz",
-      "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI="
+      "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=",
+      "optional": true
     },
     "duplexify": {
       "version": "3.5.0",
@@ -2141,6 +2161,7 @@
       "version": "2.2.2",
       "resolved": "http://registry.npm.taobao.org/ext-list/download/ext-list-2.2.2.tgz",
       "integrity": "sha1-C5jmTtgvWs8PKTG6v2khLvUt3Tc=",
+      "optional": true,
       "requires": {
         "mime-db": "^1.28.0"
       }
@@ -2149,6 +2170,7 @@
       "version": "5.0.0",
       "resolved": "http://registry.npm.taobao.org/ext-name/download/ext-name-5.0.0.tgz",
       "integrity": "sha1-cHgZgdGD7hXROZPIgiBFxQbI8KY=",
+      "optional": true,
       "requires": {
         "ext-list": "^2.0.0",
         "sort-keys-length": "^1.0.0"
@@ -2585,6 +2607,7 @@
       "version": "1.1.0",
       "resolved": "http://registry.npm.taobao.org/fd-slicer/download/fd-slicer-1.1.0.tgz",
       "integrity": "sha1-JcfInLH5B3+IkbvmHY85Dq4lbx4=",
+      "optional": true,
       "requires": {
         "pend": "~1.2.0"
       }
@@ -2615,12 +2638,14 @@
     "filename-reserved-regex": {
       "version": "2.0.0",
       "resolved": "http://registry.npm.taobao.org/filename-reserved-regex/download/filename-reserved-regex-2.0.0.tgz",
-      "integrity": "sha1-q/c9+rc10EVECr/qLZHzieu/oik="
+      "integrity": "sha1-q/c9+rc10EVECr/qLZHzieu/oik=",
+      "optional": true
     },
     "filenamify": {
       "version": "2.1.0",
       "resolved": "http://registry.npm.taobao.org/filenamify/download/filenamify-2.1.0.tgz",
       "integrity": "sha1-iPr0lfsbR6v9YSMAACoWIoxnfuk=",
+      "optional": true,
       "requires": {
         "filename-reserved-regex": "^2.0.0",
         "strip-outer": "^1.0.0",
@@ -2908,11 +2933,13 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -2925,15 +2952,18 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -3036,7 +3066,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -3046,6 +3077,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3058,17 +3090,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -3085,6 +3120,7 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -3157,7 +3193,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -3167,6 +3204,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -3272,6 +3310,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -3354,6 +3393,7 @@
       "version": "2.1.0",
       "resolved": "http://registry.npm.taobao.org/get-proxy/download/get-proxy-2.1.0.tgz",
       "integrity": "sha1-NJ8rTZHUTE1NTpy6KtkBQ/rF75M=",
+      "optional": true,
       "requires": {
         "npm-conf": "^1.1.0"
       }
@@ -3361,7 +3401,8 @@
     "get-stdin": {
       "version": "4.0.1",
       "resolved": "http://registry.npm.taobao.org/get-stdin/download/get-stdin-4.0.1.tgz",
-      "integrity": "sha1-uWjGsKBDhDJJAui/Gl3zJXmkUP4="
+      "integrity": "sha1-uWjGsKBDhDJJAui/Gl3zJXmkUP4=",
+      "optional": true
     },
     "get-stream": {
       "version": "3.0.0",
@@ -3688,29 +3729,24 @@
       }
     },
     "gulp-clean-css": {
-      "version": "4.0.0",
-      "resolved": "http://registry.npm.taobao.org/gulp-clean-css/download/gulp-clean-css-4.0.0.tgz",
-      "integrity": "sha1-G2fxY24rDac0madgI5ag1XDrliY=",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/gulp-clean-css/-/gulp-clean-css-4.1.0.tgz",
+      "integrity": "sha512-3/9MAA8eD9Qu4QGi0CexY4AaIafLAuTX9ht+w0MRyXUBAapd9Fi+h1L4xvaW/3o5ptONcr8NB23xakvIKEdRiQ==",
       "requires": {
         "clean-css": "4.2.1",
         "plugin-error": "1.0.1",
-        "through2": "3.0.0",
+        "through2": "3.0.1",
         "vinyl-sourcemaps-apply": "0.2.1"
       },
       "dependencies": {
-        "arr-diff": {
-          "version": "4.0.0",
-          "resolved": "http://registry.npm.taobao.org/arr-diff/download/arr-diff-4.0.0.tgz",
-          "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA="
-        },
         "arr-union": {
           "version": "3.1.0",
-          "resolved": "http://registry.npm.taobao.org/arr-union/download/arr-union-3.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
           "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ="
         },
         "extend-shallow": {
           "version": "3.0.2",
-          "resolved": "http://registry.npm.taobao.org/extend-shallow/download/extend-shallow-3.0.2.tgz",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
           "integrity": "sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=",
           "requires": {
             "assign-symbols": "^1.0.0",
@@ -3719,22 +3755,30 @@
         },
         "is-extendable": {
           "version": "1.0.1",
-          "resolved": "http://registry.npm.taobao.org/is-extendable/download/is-extendable-1.0.1.tgz",
-          "integrity": "sha1-p0cPnkJnM9gb2B4RVSZOOjUHyrQ=",
+          "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
+          "integrity": "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==",
           "requires": {
             "is-plain-object": "^2.0.4"
           }
         },
         "plugin-error": {
           "version": "1.0.1",
-          "resolved": "http://registry.npm.taobao.org/plugin-error/download/plugin-error-1.0.1.tgz",
-          "integrity": "sha1-dwFr2JGdCsN3/c3QMiMolTyleBw=",
+          "resolved": "https://registry.npmjs.org/plugin-error/-/plugin-error-1.0.1.tgz",
+          "integrity": "sha512-L1zP0dk7vGweZME2i+EeakvUNqSrdiI3F91TwEoYiGrAfUXmVv6fJIq4g82PAXxNsWOp0J7ZqQy/3Szz0ajTxA==",
           "requires": {
             "ansi-colors": "^1.0.1",
             "arr-diff": "^4.0.0",
             "arr-union": "^3.1.0",
             "extend-shallow": "^3.0.2"
           }
+        },
+        "through2": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-3.0.1.tgz",
+          "integrity": "sha512-M96dvTalPT3YbYLaKaCuwu+j06D/8Jfib0o/PxbVt6Amhv3dUAtW6rTV1jPgJSBG83I/e04Y6xkVdVhSRhi0ww==",
+          "requires": {
+            "readable-stream": "2 || 3"
+          }
         }
       }
     },
@@ -4246,7 +4290,8 @@
     "has-symbol-support-x": {
       "version": "1.4.2",
       "resolved": "http://registry.npm.taobao.org/has-symbol-support-x/download/has-symbol-support-x-1.4.2.tgz",
-      "integrity": "sha1-FAn5i8ACR9pF2mfO4KNvKC/yZFU="
+      "integrity": "sha1-FAn5i8ACR9pF2mfO4KNvKC/yZFU=",
+      "optional": true
     },
     "has-symbols": {
       "version": "1.0.0",
@@ -4257,6 +4302,7 @@
       "version": "1.4.1",
       "resolved": "http://registry.npm.taobao.org/has-to-string-tag-x/download/has-to-string-tag-x-1.4.1.tgz",
       "integrity": "sha1-oEWrOD17SyASoAFIqwql8pAETU0=",
+      "optional": true,
       "requires": {
         "has-symbol-support-x": "^1.4.1"
       }
@@ -4447,7 +4493,8 @@
     "ieee754": {
       "version": "1.1.12",
       "resolved": "http://registry.npm.taobao.org/ieee754/download/ieee754-1.1.12.tgz",
-      "integrity": "sha1-UL8k5bnIu5ivSWTJQc2wkY2ntgs="
+      "integrity": "sha1-UL8k5bnIu5ivSWTJQc2wkY2ntgs=",
+      "optional": true
     },
     "ignore": {
       "version": "4.0.6",
@@ -4570,6 +4617,7 @@
       "version": "2.1.0",
       "resolved": "http://registry.npm.taobao.org/indent-string/download/indent-string-2.1.0.tgz",
       "integrity": "sha1-ji1INIdCEhtKghi3oTfppSBJ3IA=",
+      "optional": true,
       "requires": {
         "repeating": "^2.0.0"
       }
@@ -4835,7 +4883,8 @@
     "is-natural-number": {
       "version": "4.0.1",
       "resolved": "http://registry.npm.taobao.org/is-natural-number/download/is-natural-number-4.0.1.tgz",
-      "integrity": "sha1-q5124dtM7VHjXeDHLr7PCfc0zeg="
+      "integrity": "sha1-q5124dtM7VHjXeDHLr7PCfc0zeg=",
+      "optional": true
     },
     "is-negated-glob": {
       "version": "1.0.0",
@@ -4931,7 +4980,8 @@
     "is-retry-allowed": {
       "version": "1.1.0",
       "resolved": "http://registry.npm.taobao.org/is-retry-allowed/download/is-retry-allowed-1.1.0.tgz",
-      "integrity": "sha1-EaBgVotnM5REAz0BJaYaINVk+zQ="
+      "integrity": "sha1-EaBgVotnM5REAz0BJaYaINVk+zQ=",
+      "optional": true
     },
     "is-stream": {
       "version": "1.1.0",
@@ -4994,6 +5044,7 @@
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/isurl/download/isurl-1.0.0.tgz",
       "integrity": "sha1-sn9PSfPNqj6kSgpbfzRi5u3DnWc=",
+      "optional": true,
       "requires": {
         "has-to-string-tag-x": "^1.2.0",
         "is-object": "^1.0.1"
@@ -5235,7 +5286,8 @@
     "lowercase-keys": {
       "version": "1.0.1",
       "resolved": "http://registry.npm.taobao.org/lowercase-keys/download/lowercase-keys-1.0.1.tgz",
-      "integrity": "sha1-b54wtHCE2XGnyCD/FabFFnt0wm8="
+      "integrity": "sha1-b54wtHCE2XGnyCD/FabFFnt0wm8=",
+      "optional": true
     },
     "lpad-align": {
       "version": "1.1.2",
@@ -5302,7 +5354,8 @@
     "map-obj": {
       "version": "1.0.1",
       "resolved": "http://registry.npm.taobao.org/map-obj/download/map-obj-1.0.1.tgz",
-      "integrity": "sha1-2TPOuSBdgr3PSIb2dCvcK03qFG0="
+      "integrity": "sha1-2TPOuSBdgr3PSIb2dCvcK03qFG0=",
+      "optional": true
     },
     "map-visit": {
       "version": "1.0.0",
@@ -5326,7 +5379,8 @@
     "mdn-data": {
       "version": "1.1.4",
       "resolved": "http://registry.npm.taobao.org/mdn-data/download/mdn-data-1.1.4.tgz",
-      "integrity": "sha1-ULXU/8RXUnZXPE7tuHgIEqhBnwE="
+      "integrity": "sha1-ULXU/8RXUnZXPE7tuHgIEqhBnwE=",
+      "optional": true
     },
     "mem": {
       "version": "1.1.0",
@@ -5419,7 +5473,8 @@
     "mime-db": {
       "version": "1.37.0",
       "resolved": "http://registry.npm.taobao.org/mime-db/download/mime-db-1.37.0.tgz",
-      "integrity": "sha1-C2oM5v2+lXbiXx8tL96IMNwK0Ng="
+      "integrity": "sha1-C2oM5v2+lXbiXx8tL96IMNwK0Ng=",
+      "optional": true
     },
     "mimic-fn": {
       "version": "1.2.0",
@@ -5665,6 +5720,7 @@
       "version": "1.1.3",
       "resolved": "http://registry.npm.taobao.org/npm-conf/download/npm-conf-1.1.3.tgz",
       "integrity": "sha1-JWzEe9DiGMJZxOlVC/QTvCGSr/k=",
+      "optional": true,
       "requires": {
         "config-chain": "^1.1.11",
         "pify": "^3.0.0"
@@ -5965,6 +6021,7 @@
       "version": "1.2.1",
       "resolved": "http://registry.npm.taobao.org/p-timeout/download/p-timeout-1.2.1.tgz",
       "integrity": "sha1-XrOzU7f86Z8QGhA4iAuwVOu+o4Y=",
+      "optional": true,
       "requires": {
         "p-finally": "^1.0.0"
       }
@@ -6109,7 +6166,8 @@
     "pend": {
       "version": "1.2.0",
       "resolved": "http://registry.npm.taobao.org/pend/download/pend-1.2.0.tgz",
-      "integrity": "sha1-elfrVQpng/kRUzH89GY9XI4AelA="
+      "integrity": "sha1-elfrVQpng/kRUzH89GY9XI4AelA=",
+      "optional": true
     },
     "pify": {
       "version": "3.0.0",
@@ -6245,7 +6303,8 @@
     "proto-list": {
       "version": "1.2.4",
       "resolved": "http://registry.npm.taobao.org/proto-list/download/proto-list-1.2.4.tgz",
-      "integrity": "sha1-IS1b/hMYMGpCD2QCuOJv85ZHqEk="
+      "integrity": "sha1-IS1b/hMYMGpCD2QCuOJv85ZHqEk=",
+      "optional": true
     },
     "proxyquire": {
       "version": "2.1.0",
@@ -6520,6 +6579,7 @@
       "version": "2.0.1",
       "resolved": "http://registry.npm.taobao.org/repeating/download/repeating-2.0.1.tgz",
       "integrity": "sha1-UhTFOpJtNVJwdSf7q0FdvAjQbdo=",
+      "optional": true,
       "requires": {
         "is-finite": "^1.0.0"
       }
@@ -6711,6 +6771,7 @@
       "version": "1.0.5",
       "resolved": "http://registry.npm.taobao.org/seek-bzip/download/seek-bzip-1.0.5.tgz",
       "integrity": "sha1-z+kXyz0nS8/6x5J1ivUxc+sfq9w=",
+      "optional": true,
       "requires": {
         "commander": "~2.8.1"
       },
@@ -6719,6 +6780,7 @@
           "version": "2.8.1",
           "resolved": "http://registry.npm.taobao.org/commander/download/commander-2.8.1.tgz",
           "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
+          "optional": true,
           "requires": {
             "graceful-readlink": ">= 1.0.0"
           }
@@ -6944,6 +7006,7 @@
       "version": "1.1.2",
       "resolved": "http://registry.npm.taobao.org/sort-keys/download/sort-keys-1.1.2.tgz",
       "integrity": "sha1-RBttTTRnmPG05J6JIK37oOVD+a0=",
+      "optional": true,
       "requires": {
         "is-plain-obj": "^1.0.0"
       }
@@ -6952,6 +7015,7 @@
       "version": "1.0.1",
       "resolved": "http://registry.npm.taobao.org/sort-keys-length/download/sort-keys-length-1.0.1.tgz",
       "integrity": "sha1-nLb09OnkgVWmqgZx7dM2/xR5oYg=",
+      "optional": true,
       "requires": {
         "sort-keys": "^1.0.0"
       }
@@ -7206,6 +7270,7 @@
       "version": "2.1.0",
       "resolved": "http://registry.npm.taobao.org/strip-dirs/download/strip-dirs-2.1.0.tgz",
       "integrity": "sha1-SYdzYmT8NEzyD2w0rKnRPR1O1sU=",
+      "optional": true,
       "requires": {
         "is-natural-number": "^4.0.1"
       }
@@ -7233,6 +7298,7 @@
       "version": "1.0.1",
       "resolved": "http://registry.npm.taobao.org/strip-outer/download/strip-outer-1.0.1.tgz",
       "integrity": "sha1-sv0qv2YEudHmATBXGV34Nrip1jE=",
+      "optional": true,
       "requires": {
         "escape-string-regexp": "^1.0.2"
       }
@@ -7437,12 +7503,14 @@
     "temp-dir": {
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/temp-dir/download/temp-dir-1.0.0.tgz",
-      "integrity": "sha1-CnwOom06Oa+n4OvqnB/AvE2qAR0="
+      "integrity": "sha1-CnwOom06Oa+n4OvqnB/AvE2qAR0=",
+      "optional": true
     },
     "tempfile": {
       "version": "2.0.0",
       "resolved": "http://registry.npm.taobao.org/tempfile/download/tempfile-2.0.0.tgz",
       "integrity": "sha1-awRGhWqbERTRhW/8vlCczLCXcmU=",
+      "optional": true,
       "requires": {
         "temp-dir": "^1.0.0",
         "uuid": "^3.0.1"
@@ -7644,7 +7712,8 @@
     "timed-out": {
       "version": "4.0.1",
       "resolved": "http://registry.npm.taobao.org/timed-out/download/timed-out-4.0.1.tgz",
-      "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8="
+      "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
+      "optional": true
     },
     "tmp": {
       "version": "0.0.33",
@@ -7786,6 +7855,7 @@
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/trim-repeated/download/trim-repeated-1.0.0.tgz",
       "integrity": "sha1-42RqLqTokTEr9+rObPsFOAvAHCE=",
+      "optional": true,
       "requires": {
         "escape-string-regexp": "^1.0.2"
       }
@@ -7799,6 +7869,7 @@
       "version": "0.6.0",
       "resolved": "http://registry.npm.taobao.org/tunnel-agent/download/tunnel-agent-0.6.0.tgz",
       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "optional": true,
       "requires": {
         "safe-buffer": "^5.0.1"
       }
@@ -7834,6 +7905,7 @@
       "version": "1.3.1",
       "resolved": "http://registry.npm.taobao.org/unbzip2-stream/download/unbzip2-stream-1.3.1.tgz",
       "integrity": "sha1-eFTaUWIqfmNiQiEZY1eAO1UpZqE=",
+      "optional": true,
       "requires": {
         "buffer": "^3.0.1",
         "through": "^2.3.6"
@@ -7990,7 +8062,8 @@
     "url-to-options": {
       "version": "1.0.1",
       "resolved": "http://registry.npm.taobao.org/url-to-options/download/url-to-options-1.0.1.tgz",
-      "integrity": "sha1-FQWgOiiaSMvXpDTvuu7FBV9WM6k="
+      "integrity": "sha1-FQWgOiiaSMvXpDTvuu7FBV9WM6k=",
+      "optional": true
     },
     "use": {
       "version": "3.1.1",
@@ -8015,7 +8088,8 @@
     "uuid": {
       "version": "3.3.2",
       "resolved": "http://registry.npm.taobao.org/uuid/download/uuid-3.3.2.tgz",
-      "integrity": "sha1-G0r0lV6zB3xQHCOHL8ZROBFYcTE="
+      "integrity": "sha1-G0r0lV6zB3xQHCOHL8ZROBFYcTE=",
+      "optional": true
     },
     "v8flags": {
       "version": "3.1.1",
@@ -8335,6 +8409,7 @@
       "version": "2.10.0",
       "resolved": "http://registry.npm.taobao.org/yauzl/download/yauzl-2.10.0.tgz",
       "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "optional": true,
       "requires": {
         "buffer-crc32": "~0.2.3",
         "fd-slicer": "~1.1.0"
diff --git a/package.json b/package.json
index 46144b1..17ddfba 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "frep": "~0.2.3",
     "fs-extra": "~7.0.1",
     "gulp": "~4.0.0",
-    "gulp-clean-css": "~4.0.0",
+    "gulp-clean-css": "~4.1.0",
     "gulp-concat": "~2.6.1",
     "gulp-filter": "~5.1.0",
     "gulp-if": "~2.0.2",