bump_version()
Bump package version
commit_version()
Commits NEWS.md and DESCRIPTION to Git
finalize_version()
Finalize package version
get_last_tag()
The most recent tag
get_top_level_commits()
All top-level commits
tag_version()
Create a new version tag
unbump_version()
Undoes bumping the package version
update_news()
Update NEWS.md with messages from top-level commits
update_version()
Update NEWS.md and DESCRIPTION with a new version