RELEASING.md

New release steps

Pre-release (vX.Y.0-rcN)

1. Tag vX.Y.0-rcN on master

Normal release (vX.Y.0)

1. Tag vX.Y.0 on master
2. Create version branch vX.Y
3. Force-push release branch (or fast-forward if possible)
4. Update topic on IRC #libplacebo
5. Bump 'X' version number in meson.build, for next release (optional)
6. Tag release on github

Bugfix release (vX.Y.Z)

1. Cherry-pick bug fixes onto version branch (vX.Y)
2. Update Z version number in meson.build
3. Tag vX.Y.Z on this branch
4. Fast-forward release branch iff this is the latest major release
5. Update topic on IRC #libplacebo
6. Tag release on github