chore(deps): update dependency @babel/core to v7.6.4 (#451)

Author: renovate[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "vue-template-compiler": "^2.6.10"
   },
   "devDependencies": {
-    "@babel/core": "7.6.3",
+    "@babel/core": "7.6.4",
     "@babel/plugin-proposal-object-rest-spread": "7.6.2",
     "@babel/plugin-transform-object-assign": "7.2.0",
     "@babel/preset-env": "7.6.3",