fix(package): update file-loader to version 5.0.0

Closes #236

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "express-jwt": "^5.3.0",
     "express-promise-router": "^3.0.1",
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
-    "file-loader": "^1.1.6",
+    "file-loader": "^5.0.0",
     "history": "^4.7.2",
     "html-webpack-plugin": "^3.0.0",
     "jsonwebtoken": "^8.1.0",