Bump @babel/polyfill from 7.0.0 to 7.2.5

Bumps [@babel/polyfill](https://github.com/babel/babel) from 7.0.0 to 7.2.5.
- [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/v7.0.0...v7.2.5

)

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Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>