Merge pull request #2559 from LLK/greenkeeper/css-loader-1.0.0

Update css-loader to the latest version 

package.json

@@ -45,7 +45,7 @@
     "classnames": "2.2.6",
     "copy-webpack-plugin": "^4.5.1",
     "core-js": "2.5.7",
-    "css-loader": "^0.28.11",
+    "css-loader": "^1.0.0",
     "enzyme": "^3.1.0",
     "enzyme-adapter-react-16": "1.1.1",
     "es6-object-assign": "1.1.0",