Bump @babel/core from 7.6.4 to 7.7.0 (#6181)

Bumps [@babel/core](https://github.com/babel/babel) from 7.6.4 to 7.7.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.6.4...v7.7.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -57,7 +57,7 @@
   },
   "devDependencies": {
     "@babel/cli": "7.6.4",
-    "@babel/core": "7.6.4",
+    "@babel/core": "7.7.0",
     "@babel/plugin-proposal-object-rest-spread": "7.6.2",
     "@babel/plugin-transform-flow-strip-types": "7.6.3",
     "@babel/preset-env": "7.6.3",