chore(package): update url-loader to version 2.1.0

Closes #8

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "html-webpack-plugin": "^3.2.0",
     "standard": "^12.0.1",
     "style-loader": "^0.23.0",
-    "url-loader": "^1.1.1",
+    "url-loader": "^2.1.0",
     "webpack": "^4.19.0",
     "webpack-cli": "^3.1.0"
   }