chore(deps): update dependency url-loader to v3 (#1631)

Author: renovate[bot]

package.json

@@ -151,7 +151,7 @@
         "stylelint-config-standard": "^19.0.0",
         "through2": "^3.0.0",
         "uglifyjs-webpack-plugin": "^2.1.1",
-        "url-loader": "^1.1.2",
+        "url-loader": "^3.0.0",
         "vue": "^2.6.11",
         "vue-antd-md-loader": "^1.1.0",
         "vue-clipboard2": "0.3.1",