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

Closes #32

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "eslint-loader": "2.2.0",
     "eslint-plugin-flowtype": "3.11.1",
     "eslint-plugin-react": "^7.0.0",
-    "file-loader": "4.0.0",
+    "file-loader": "4.3.0",
     "flow-bin": "0.102.0",
     "flow-typed": "2.5.2",
     "graceful-fs": "4.2.0",