chore(package): update file-loader to version 6.0.0

Closes #69

Author: greenkeeper[bot]

package.json

@@ -69,7 +69,7 @@
     "eslint-plugin-html": "^4.0.6",
     "eslint-plugin-vue": "^5.0.0",
     "extract-text-webpack-plugin": "^3.0.0",
-    "file-loader": "^3.0.0",
+    "file-loader": "^6.0.0",
     "friendly-errors-webpack-plugin": "^1.6.1",
     "html-webpack-plugin": "^3.2.0",
     "jest": "^23.6.0",