chore(deps): update dependency uglifyjs-webpack-plugin to v2

Author: renovate-bot

advanced/package.json

@@ -54,7 +54,7 @@
     "semver": "5.7.0",
     "shelljs": "0.8.3",
     "tachyons": "4.11.1",
-    "uglifyjs-webpack-plugin": "1.3.0",
+    "uglifyjs-webpack-plugin": "2.1.3",
     "url-loader": "0.6.2",
     "vue-loader": "14.2.4",
     "vue-style-loader": "4.1.2",