Bump @babel/core from 7.7.2 to 7.7.4

Bumps [@babel/core](https://github.com/babel/babel) from 7.7.2 to 7.7.4.
- [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/v7.7.2...v7.7.4)

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

package.json

@@ -8,7 +8,7 @@
   },
   "devDependencies": {
     "@babel/cli": "^7.7.0",
-    "@babel/core": "^7.7.2",
+    "@babel/core": "^7.7.4",
     "@babel/node": "^7.7.0",
     "@babel/plugin-proposal-class-properties": "^7.7.0",
     "@babel/plugin-proposal-optional-chaining": "^7.6.0",