Bump puma from 3.12.0 to 3.12.1

[dependabot-preview[bot]]

Bumps puma from 3.12.0 to 3.12.1.

Release notes

*Sourced from [puma's releases](https://github.com/puma/puma/releases).* > v3.12.1

Changelog

*Sourced from [puma's changelog](https://github.com/puma/puma/blob/master/History.md).* > ## 3.12.1 / 2019-03-19 > > * 1 features > * Internal strings are frozen ([#1649](https://github-redirect.dependabot.com/puma/puma/issues/1649)) > * 3 bugfixes > * Fix chunked ending check ([#1607](https://github-redirect.dependabot.com/puma/puma/issues/1607)) > * Rack handler should use provided default host ([#1700](https://github-redirect.dependabot.com/puma/puma/issues/1700)) > * Better support for detecting runtimes that support `fork` ([#1630](https://github-redirect.dependabot.com/puma/puma/issues/1630))

Commits

- [`c24c0c8`](https://github.com/puma/puma/commit/c24c0c883496f581d9092bbe7f7431129eeb7190) Rack handler should use provided default host - [`e5d566e`](https://github.com/puma/puma/commit/e5d566ed81f3663d70f0318f8bf3d858734cb74b) Merge pull request [#1682](https://github-redirect.dependabot.com/puma/puma/issues/1682) from MSP-Greg/update-travis-ruby - [`cecc44a`](https://github.com/puma/puma/commit/cecc44aa0ae326e46031b48023253d08df706455) Merge pull request [#1701](https://github-redirect.dependabot.com/puma/puma/issues/1701) from schneems/schneems/m - [`ce57cfb`](https://github.com/puma/puma/commit/ce57cfb8c3c8259cda13c322de32dd4ff07ec03a) Allow running individual tests via the `m` gem. - [`7915afc`](https://github.com/puma/puma/commit/7915afc340575ec3e90746884f7251b7d1554af8) update for RubyGems 3.0 - [`2db6d4d`](https://github.com/puma/puma/commit/2db6d4d779bac0d369e8b262090c0e8cddbccb73) update travis rubies - 2.3.8, 2.4.5, 2.5.3 - [`2668597`](https://github.com/puma/puma/commit/2668597ec1dd9546d83db9f2ec5ad092add483e6) Merge pull request [#1649](https://github-redirect.dependabot.com/puma/puma/issues/1649) from puma/schneems/frozen - [`9de253d`](https://github.com/puma/puma/commit/9de253dee0f044dc92f14df74a1ded56c8198723) Merge pull request [#1653](https://github-redirect.dependabot.com/puma/puma/issues/1653) from MSP-Greg/test_rack_handler - [`4bb40e1`](https://github.com/puma/puma/commit/4bb40e117ff65badcb585ee05325a25b16ec2563) windows add two tests - test\test_rack_handler.rb - [`72882f2`](https://github.com/puma/puma/commit/72882f2319e65b371e1458069723279b3196a220) Merge pull request [#1637](https://github-redirect.dependabot.com/puma/puma/issues/1637) from MSP-Greg/make_ci_work - Additional commits viewable in [compare view](https://github.com/puma/puma/compare/v3.12.0...v3.12.1)

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Dependabot will merge this PR once CI passes on it, as requested by @mischa-s.

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[mischa-s]

@dependabot squash and merge