build: bump concurrent-ruby from 1.1.5 to 1.1.6 in /docs

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.1.5 to 1.1.6.
- [Release notes](https://github.com/ruby-concurrency/concurrent-ruby/releases)
- [Changelog](https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ruby-concurrency/concurrent-ruby/compare/v1.1.5...v1.1.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2020-02-11 05:12:38 +00:00 committed by GitHub
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commit 2f66f98f0a
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@ -16,7 +16,7 @@ GEM
colorator (1.1.0)
commonmarker (0.17.13)
ruby-enum (~> 0.5)
concurrent-ruby (1.1.5)
concurrent-ruby (1.1.6)
dnsruby (1.61.3)
addressable (~> 2.5)
em-websocket (0.5.1)