Bumps [capistrano-bundler](https://github.com/capistrano/bundler) from 1.3.0 to 1.6.0.
- [Release notes](https://github.com/capistrano/bundler/releases)
- [Changelog](https://github.com/capistrano/bundler/blob/master/CHANGELOG.md)
- [Commits](https://github.com/capistrano/bundler/compare/v1.3.0...v1.6.0

)

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