Bump rollup-plugin-babel from 4.3.3 to 4.4.0

Bumps [rollup-plugin-babel](https://github.com/rollup/rollup-plugin-babel) from 4.3.3 to 4.4.0.
- [Release notes](https://github.com/rollup/rollup-plugin-babel/releases)
- [Changelog](https://github.com/rollup/rollup-plugin-babel/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup-plugin-babel@v4.3.3...v4.4.0)

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