chore(package): update style-loader to version 0.18.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -66,7 +66,7 @@
     "react-addons-css-transition-group": "15.3.1",
     "react-addons-test-utils": "15.3.1",
     "react-dom": "15.3.1",
-    "style-loader": "0.13.1",
+    "style-loader": "0.18.1",
     "stylus": "0.54.5",
     "stylus-loader": "2.3.1",
     "testdouble": "^1.4.2",