Update bundler requirement from 2.1.4 to 2.2.2 (#262)
Update bundler requirement from 2.1.4 to 2.2.2 (#262)

Updates the requirements on [bundler](https://github.com/rubygems/rubygems) to permit the latest version.
- [Release notes](https://github.com/rubygems/rubygems/releases)
- [Changelog](https://github.com/rubygems/rubygems/blob/master/bundler/CHANGELOG.md)
- [Commits](https://github.com/rubygems/rubygems/compare/v2.1.4...bundler-v2.2.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
Co-authored-by: Marco Ferrari <609f8c4cba1ebb406f358a83e24aee962f9f188a@gmail.com>
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