build(deps): bump puma from 3.11.4 to 3.12.0

[dependabot-preview]

Bumps puma from 3.11.4 to 3.12.0.

Changelog

Sourced from puma's changelog.

3.12.0 / 2018-07-13

• 5 features:

  • You can now specify which SSL ciphers the server should support, default is unchanged (#1478)
  • The setting for Puma's max_threads is now in Puma.stats (#1604)
  • Pool capacity is now in Puma.stats (#1579)
  • Installs restricted to Ruby 2.2+ (#1506)
  • --control is now deprecated in favor of --control-url (#1487)

• 2 bugfixes:

  • Workers will no longer accept more web requests than they have capacity to process. This prevents an issue where one worker would accept lots of requests while starving other workers (#1563)
  • In a test env puma now emits the stack on an exception (#1557)

Commits

• f7e1e58 Merge pull request #1614 from puma/schneems/version-bump
• 8eb215d v3.12.0
• c3b3a97 Merge pull request #1611 from jkutner/master
• db9e26a Update url for binder parsing test for JRuby
• 7f71af4 Merge pull request #1604 from puma/schneems/max-thread-metric
• fb2ca4c Add max_threads to Puma.stats
• 5a7d884 Merge pull request #1579 from puma/schneems/waiting
• e4255d0 Merge pull request #1478 from eallison91/dev/ssl_cipher_support
• 6d0efee Add support for --control-url (#1487)
• 4a7a9be Fix ssl_v3_rejection test hanging (#1567)
• Additional commits viewable in compare view

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⚠️ Dependabot is rebasing this PR ⚠️

Sit tight and this PR will be updated for you in a minute. If you make any changes yourself then they'll take precedence over the rebase (which will be abandoned).

[coveralls]

Pull Request Test Coverage Report for Build 196

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 188:	0.0%
Covered Lines:	6
Relevant Lines:	6

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💛 - Coveralls

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.

[microlith57]

@dependabot reopen