Bump wp-coding-standards/wpcs from 2.2.0 to 2.2.1

Bumps [wp-coding-standards/wpcs](https://github.com/WordPress/WordPress-Coding-Standards) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/WordPress/WordPress-Coding-Standards/releases)
- [Changelog](https://github.com/WordPress/WordPress-Coding-Standards/blob/develop/CHANGELOG.md)
- [Commits](WordPress/WordPress-Coding-Standards@2.2.0...2.2.1)

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