build: update dependency fetch-mock to v8.3.1

Author: renovate-bot

package.json

@@ -17,7 +17,7 @@
     "babel-preset-env": "1.7.0",
     "coveralls": "3.0.9",
     "del": "5.1.0",
-    "fetch-mock": "8.3.0",
+    "fetch-mock": "8.3.1",
     "gulp": "3.9.1",
     "gulp-babel": "7.0.1",
     "gulp-rename": "2.0.0",

yarn.lock

@@ -3924,10 +3924,10 @@ 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@8.3.0:
-  version "8.3.0"
-  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-8.3.0.tgz#dac9a7f781d970e712ef2ccebf95db279bc80a6e"
-  integrity sha512-khTaO5bUjvlgR8Do7XDtBzLHztDUFej5CvFBByM+B+t4HrE6164QvL5NBATkKiEY/vAfkrsl6taTsxHafwTJIQ==
+fetch-mock@8.3.1:
+  version "8.3.1"
+  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-8.3.1.tgz#9c79aab22fa1752fe00b487e2b271ecfc1138461"
+  integrity sha512-7IEIUvkHO6zOHbDSzkMAvkb2mx3N5xy9BS4RjFnIe8kCUDOomoNKBDKGwhTj5E0uuieo8rg55c6cUKorJuk4rg==
   dependencies:
     babel-runtime "^6.26.0"
     core-js "^3.0.0"