chore(package): update file-loader to version 4.1.0

Closes #7

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "clean-webpack-plugin": "^1.0.0",
     "css-loader": "^2.0.0",
-    "file-loader": "^3.0.0",
+    "file-loader": "^4.1.0",
     "html-webpack-inline-source-plugin": "0.0.10",
     "html-webpack-plugin": "^3.2.0",
     "standard": "^12.0.1",