chore(package): update url-loader to version 0.6.1

Author: greenkeeper[bot]

package.json

@@ -235,7 +235,7 @@
     "style-loader": "^0.18.2",
     "sw-precache-webpack-plugin": "^0.11.3",
     "timekeeper": "^1.0.0",
-    "url-loader": "^0.5.7",
+    "url-loader": "^0.6.1",
     "webpack": "^3.5.5",
     "webpack-dev-middleware": "^1.12.0",
     "webpack-hot-middleware": "^2.17.0",