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

Closes #53

Author: greenkeeper[bot]

Diff for: package.json

@@ -16,7 +16,7 @@
     "copyfiles": "2.1.0",
     "cross-env": "5.2.0",
     "css-loader": "2.1.1",
-    "file-loader": "3.0.1",
+    "file-loader": "4.3.0",
     "fork-ts-checker-webpack-plugin": "^1.3.3",
     "html-loader": "0.5.5",
     "html-webpack-plugin": "^3.2.0",