Bump rack from 2.0.4 to 2.0.7
Bump rack from 2.0.4 to 2.0.7

Bumps [rack](https://github.com/rack/rack) from 2.0.4 to 2.0.7.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/2.0.4...2.0.7)
heavywater/knife-cookbook-cleanup