fix(package): update url-loader to version 2.3.0

Closes #177

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "ts-loader": "^3.1.0",
     "typescript": "^2.4.2",
     "typings": "^2.1.1",
-    "url-loader": "~1.1.2",
+    "url-loader": "~2.3.0",
     "webpack": "^4.29.5",
     "webpack-dev-server": "^3.2.0",
     "zone.js": "^0.8.16"