diff --git a/package-lock.json b/package-lock.json
index 77c6fc9..d391e81 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "seventy",
-  "version": "1.2.1",
+  "version": "1.3.1",
   "lockfileVersion": 1,
   "requires": true,
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@@ -1423,7 +1423,7 @@
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-      "resolved": "http://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
       "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
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@@ -1927,7 +1927,7 @@
       "dependencies": {
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-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
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@@ -4379,7 +4379,7 @@
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-          "resolved": "http://registry.npmjs.org/domelementtype/-/domelementtype-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.1.3.tgz",
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@@ -4517,18 +4517,32 @@
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-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.2.tgz",
-      "integrity": "sha512-f4x70okzZbIQl/NSRLkI/+tteV/9WqL98zx+SQ69KbXxmVrmjwsNUPn/gYJJ0sHvEak24cZgHIPegRePAtA/xw==",
+      "version": "6.5.4",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
       "dev": true,
       "requires": {
-        "bn.js": "^4.4.0",
-        "brorand": "^1.0.1",
+        "bn.js": "^4.11.9",
+        "brorand": "^1.1.0",
         "hash.js": "^1.0.0",
-        "hmac-drbg": "^1.0.0",
-        "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0",
-        "minimalistic-crypto-utils": "^1.0.0"
+        "hmac-drbg": "^1.0.1",
+        "inherits": "^2.0.4",
+        "minimalistic-assert": "^1.0.1",
+        "minimalistic-crypto-utils": "^1.0.1"
+      },
+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+          "dev": true
+        },
+        "inherits": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+          "dev": true
+        }
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@@ -6526,7 +6540,7 @@
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     "http-errors": {
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-      "resolved": "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
       "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
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@@ -7361,7 +7375,7 @@
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-      "resolved": "http://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
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@@ -7414,7 +7428,7 @@
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-          "resolved": "http://registry.npmjs.org/yargs/-/yargs-6.6.0.tgz",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-6.6.0.tgz",
           "integrity": "sha1-eC7CHvQDNF+DCoCMo9UTr1YGUgg=",
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@@ -7823,7 +7837,7 @@
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     "minimist": {
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-      "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
       "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
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@@ -7883,7 +7897,7 @@
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-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
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           "dev": true
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@@ -8031,7 +8045,7 @@
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         "semver": {
           "version": "5.3.0",
-          "resolved": "http://registry.npmjs.org/semver/-/semver-5.3.0.tgz",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.3.0.tgz",
           "integrity": "sha1-myzl094C0XxgEq0yaqa00M9U+U8=",
           "dev": true
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@@ -8120,7 +8134,7 @@
       "dependencies": {
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-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
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@@ -8351,7 +8365,7 @@
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         "yargs": {
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-          "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.32.0.tgz",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.32.0.tgz",
           "integrity": "sha1-AwiOnr+edWtpdRYR0qXvWRSCyZU=",
           "dev": true,
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@@ -8648,7 +8662,7 @@
       "dependencies": {
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-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
           "integrity": "sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8=",
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@@ -8698,7 +8712,7 @@
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     "os-locale": {
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-      "resolved": "http://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
+      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
       "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
       "dev": true,
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@@ -8981,7 +8995,7 @@
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     "pify": {
       "version": "2.3.0",
-      "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
       "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
       "dev": true
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@@ -10002,7 +10016,7 @@
         },
         "yargs": {
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-          "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
           "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
           "dev": true,
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@@ -10199,7 +10213,7 @@
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     "readable-stream": {
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-      "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
       "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
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@@ -10326,7 +10340,7 @@
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     "regexpu-core": {
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-      "resolved": "http://registry.npmjs.org/regexpu-core/-/regexpu-core-2.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/regexpu-core/-/regexpu-core-2.0.0.tgz",
       "integrity": "sha1-SdA4g3uNz4v6W5pCE5k45uoq4kA=",
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@@ -10337,13 +10351,13 @@
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     "regjsgen": {
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-      "resolved": "http://registry.npmjs.org/regjsgen/-/regjsgen-0.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/regjsgen/-/regjsgen-0.2.0.tgz",
       "integrity": "sha1-bAFq3qxVT3WCP+N6wFuS1aTtsfc=",
       "dev": true
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     "regjsparser": {
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-      "resolved": "http://registry.npmjs.org/regjsparser/-/regjsparser-0.1.5.tgz",
+      "resolved": "https://registry.npmjs.org/regjsparser/-/regjsparser-0.1.5.tgz",
       "integrity": "sha1-fuj4Tcb6eS0/0K4ijSS9lJ6tIFw=",
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@@ -10760,7 +10774,7 @@
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-          "resolved": "http://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
           "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
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@@ -11567,7 +11581,7 @@
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-      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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@@ -11776,7 +11790,7 @@
       "dependencies": {
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-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
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@@ -11819,7 +11833,7 @@
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         "chalk": {
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-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-0.4.0.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-0.4.0.tgz",
           "integrity": "sha1-UZmj3c0MHv4jvAjBsCewYXbgxk8=",
           "dev": true,
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@@ -11830,7 +11844,7 @@
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-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-0.1.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-0.1.1.tgz",
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@@ -12941,7 +12955,7 @@
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-      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
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@@ -12990,7 +13004,7 @@
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     "yargs": {
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-      "resolved": "http://registry.npmjs.org/yargs/-/yargs-6.4.0.tgz",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-6.4.0.tgz",
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@@ -13012,7 +13026,7 @@
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-      "resolved": "http://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
       "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
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