Merge branch 'master' into greenkeeper/mini-css-extract-plugin-0.4.5

Author: philwareham

package.json

@@ -22,7 +22,7 @@
     "cross-env": "5.2.0",
     "css-loader": "1.0.1",
     "dart-sass": "1.15.1",
-    "fibers": "3.1.0",
+    "fibers": "3.1.1",
     "mini-css-extract-plugin": "0.4.5",
     "postcss-loader": "3.0.0",
     "sass-loader": "7.1.0",