* CHANGELOGs are now per-version
* CHANGELOGs are now RST format
* CHANGELOGs are now generated via reno from YAML fragments located in changelogs/fragements. This allows feature/bugfix changelog fragments to be cherry-picked alongside the code changes
* each version's CHANGELOG_vX.Y.rst is generatd at release-time and can be easily copied/cherry-picked into other branches
