Add support for release pull requests as an optional workflow. When
usingrelease PRs, the release tag SHOULD be placed on the resulting
merge commitrather than the version bump commit itself.
Changes:
- Add new item 7.5 defining release pull requests
- Update item 7.4 to reference the release PR exception
- Update item 8.6 to allow tagging merge commits for release branch PRs
- Renumber items 7.5-7.9 to 7.6-7.10