chore(package): update style-loader to version 0.23.1

Closes #44

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "offline-plugin": "^4.8.3",
     "optimize-js-plugin": "^0.0.4",
     "react-hot-loader": "^4.0.1",
-    "style-loader": "^0.20.0",
+    "style-loader": "^0.23.1",
     "webpack": "^3.11.0",
     "webpack-bundle-analyzer": "^2.9.1",
     "webpack-dev-server": "^2.11.2"