build: bump yell from 2.2.0 to 2.2.1 in /docs

Bumps [yell](https://github.com/rudionrails/yell) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/rudionrails/yell/releases)
- [Commits](https://github.com/rudionrails/yell/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2020-01-08 21:49:47 +00:00 committed by GitHub
parent bcb8f4da5f
commit 99368c0171
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@ -248,7 +248,7 @@ GEM
tzinfo (1.2.6)
thread_safe (~> 0.1)
unicode-display_width (1.6.0)
yell (2.2.0)
yell (2.2.1)
zeitwerk (2.2.2)
PLATFORMS