Bump babel from 5.8.38 to 6.23.0
Bump babel from 5.8.38 to 6.23.0

Bumps [babel](https://github.com/babel/babel) from 5.8.38 to 6.23.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/v6.23.0/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v5.8.38...v6.23.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
johngeorgewright/promsync,johngeorgewright/promsync