Bump @babel/core from 7.8.6 to 7.9.0

Bumps [@babel/core](https://github.com/babel/babel) from 7.8.6 to 7.9.0.
- [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/v7.8.6...v7.9.0)

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

package.json

@@ -60,7 +60,7 @@
   "devDependencies": {
     "@ava/babel": "1.0.1",
     "@babel/cli": "7.8.4",
-    "@babel/core": "7.8.6",
+    "@babel/core": "7.9.0",
     "@babel/plugin-proposal-class-properties": "^7.8.3",
     "@babel/plugin-proposal-numeric-separator": "^7.8.3",
     "@babel/plugin-proposal-object-rest-spread": "^7.8.3",