kettle-family 1.2.0: Clean up locally installed unpublished gems

🏷️ release kettle-family 🏷️ 1.2.0

Version 1.2.0 adds clean-unreleased, which finds selected family gems installed above their latest released versions. It provides a recovery path after a failed release leaves unpublished local installations behind.

Read the upstream release notes for the complete changes and see the project repository for usage and installation.