chore(deps): update dependency style-loader to v4

Author: renovate[bot]

package.json

@@ -42,7 +42,7 @@
     "eslint": "2.13.1",
     "rollup": "0.25.8",
     "rollup-plugin-babel": "2.7.1",
-    "style-loader": "0.13.2",
+    "style-loader": "4.0.0",
     "webpack": "1.15.0"
   }
 }