Pull Request #97 Bump puma from 3.12.0 to 4.3.8

Bumps [puma](https://github.com/puma/puma) from 3.12.0 to 4.3.8.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v3.12.0...v4.3.8)

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