kettle-dev 3.0.0: A standalone changelog executable

🏷️ release kettle-dev 🏷️ 3.0.0

Version 3.0.0 moves kettle-changelog into its own gem while retaining transition support APIs. Release-tool integrations should review where they obtain that executable when updating their development dependencies.

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