build: update dependency fetch-mock to v7.2.3

Author: renovate-bot

package.json

@@ -17,7 +17,7 @@
     "babel-preset-env": "1.7.0",
     "coveralls": "3.0.2",
     "del": "3.0.0",
-    "fetch-mock": "7.2.2",
+    "fetch-mock": "7.2.3",
     "gulp": "3.9.1",
     "gulp-babel": "7.0.1",
     "gulp-rename": "1.4.0",

yarn.lock

@@ -2974,9 +2974,9 @@ fetch-ie8@^1.4.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/fetch-ie8/-/fetch-ie8-1.5.0.tgz#f1141c3f96cbc8937aa31b0fbc1a770220fbc15b"
 
-fetch-mock@7.2.2:
-  version "7.2.2"
-  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-7.2.2.tgz#29c5bfa0924fb82ad09d576507b7e588b3539b89"
+fetch-mock@7.2.3:
+  version "7.2.3"
+  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-7.2.3.tgz#56716b016362138f0488a467d04975c5c610be3b"
   dependencies:
     babel-polyfill "^6.26.0"
     glob-to-regexp "^0.4.0"