chore: install core-js

Author: Guillaume Chau

packages/@vue/cli-ui/package.json

@@ -72,6 +72,7 @@
     "@vue/ui": "^0.9.2",
     "ansi_up": "^3.0.0",
     "apollo-client": "^2.0.0",
+    "core-js": "^3.0.1",
     "cross-env": "^5.1.5",
     "eslint": "^5.16.0",
     "eslint-plugin-graphql": "^3.0.3",
@@ -83,7 +84,7 @@
     "stylus": "^0.54.5",
     "stylus-loader": "^3.0.1",
     "vue": "^2.6.10",
-    "vue-apollo": "^3.0.0-beta.25",
+    "vue-apollo": "^3.0.0-beta.29",
     "vue-color": "^2.4.6",
     "vue-i18n": "^8.11.2",
     "vue-instantsearch": "^1.5.1",