chore(package): update style-loader to version 0.20.0

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "regenerator": "^0.12.0",
     "sass-loader": "^6.0.5",
     "scripty": "^1.7.2",
-    "style-loader": "^0.19.0",
+    "style-loader": "^0.20.0",
     "uglify-js-es6": "^2.8.9",
     "uglifyjs-webpack-plugin": "^1.0.0",
     "webpack": "^3.5.1",