fix ci issue

mindinsight/ui/babel.config.js

@@ -18,7 +18,7 @@ module.exports = {
     [
       '@vue/app',
       {
-        polyfills: ['es6.promise', 'es6.symbol'],
+        polyfills: ['es.promise', 'es.symbol'],
       },
     ],
   ],

mindinsight/ui/package.json

@@ -24,7 +24,6 @@
     "@intlify/vue-i18n-loader": "0.6.1",
     "@vue/cli-service": "4.1.0",
     "@vue/cli-plugin-babel": "4.1.0",
-    "babel-core": "6.26.0",
     "babel-eslint": "10.0.3",
     "eslint": "6.6.0",
     "eslint-config-google": "0.13.0",