Bump phan/phan from 1.3.4 to 2.0.0

Bumps [phan/phan](https://github.com/phan/phan) from 1.3.4 to 2.0.0.
- [Release notes](https://github.com/phan/phan/releases)
- [Changelog](https://github.com/phan/phan/blob/master/NEWS.md)
- [Commits](https://github.com/phan/phan/compare/1.3.4...2.0.0)