chore(package): update url-loader to version 3.0.0

Closes #70

Author: greenkeeper[bot]

package.json

@@ -85,7 +85,7 @@
     "semver": "^5.3.0",
     "shelljs": "^0.7.6",
     "uglifyjs-webpack-plugin": "^1.3.0",
-    "url-loader": "^0.5.8",
+    "url-loader": "^3.0.0",
     "vue": "^2.5.17",
     "vue-jest": "^3.0.1",
     "vue-loader": "^13.3.0",