chore(package): update sass-loader to version 5.0.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -96,7 +96,7 @@
     "raw-loader": "0.5.1",
     "resolve-url-loader": "^1.4.3",
     "rimraf": "~2.5.4",
-    "sass-loader": "^4.1.1",
+    "sass-loader": "^5.0.0",
     "script-ext-html-webpack-plugin": "^1.5.0",
     "source-map-loader": "^0.1.6",
     "string-replace-loader": "1.0.5",