chore(package): update file-loader to version 4.3.0

Closes #575

Author: greenkeeper[bot]

package.json

@@ -134,7 +134,7 @@
     "exports-loader": "^0.6.3",
     "expose-loader": "^0.7.1",
     "extract-text-webpack-plugin": "~3.0.1",
-    "file-loader": "^1.0.0",
+    "file-loader": "^4.3.0",
     "find-root": "^1.0.0",
     "gh-pages": "^1.0.0",
     "html-webpack-plugin": "^2.30.1",