Bumps [capistrano-rbenv](https://github.com/capistrano/rbenv) from 2.1.6 to 2.2.0.
- [Release notes](https://github.com/capistrano/rbenv/releases)
- [Commits](https://github.com/capistrano/rbenv/compare/v2.1.6...v2.2.0

)

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