Bumps [minitest](https://github.com/seattlerb/minitest) from 5.12.2 to 5.13.0.
- [Release notes](https://github.com/seattlerb/minitest/releases)
- [Changelog](https://github.com/seattlerb/minitest/blob/master/History.rdoc)
- [Commits](https://github.com/seattlerb/minitest/compare/v5.12.2...v5.13.0

)

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