Bumps [mime-types](https://github.com/mime-types/ruby-mime-types) from 3.1 to 3.2.2.
- [Release notes](https://github.com/mime-types/ruby-mime-types/releases)
- [Changelog](https://github.com/mime-types/ruby-mime-types/blob/master/History.md)
- [Commits](https://github.com/mime-types/ruby-mime-types/compare/v3.1...v3.2.2

)

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