Bump @babel/core from 7.6.2 to 7.6.4

Bumps [@babel/core](https://github.com/babel/babel) from 7.6.2 to 7.6.4.
- [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/v7.6.2...v7.6.4)

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

package.json

@@ -49,7 +49,7 @@
 		"node": ">=10.0.0"
 	},
 	"devDependencies": {
-		"@babel/core": "^7.6.2",
+		"@babel/core": "^7.6.4",
 		"@babel/plugin-syntax-dynamic-import": "^7.0.0",
 		"@babel/preset-env": "^7.6.2",
 		"@vue/test-utils": "^1.0.0-beta.29",