Bump @babel/preset-env from 7.3.1 to 7.3.4

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.3.1 to 7.3.4.
- [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/v7.3.1...v7.3.4)
Signed-off-by: dependabot[bot] <support@dependabot.com>