the ability to ignore pre-release commits

[jrosen]

Use Case: we are tagging every commit to master with a release candidate pre-release tag (e.g. 1.2.3-RC.4) . Right now, we run changelog and it makes a new version entry for every pre-release, which is nice for unreleased changes... however, during a normal release, I'd like to re-generate the changelog, have it ignore pre-release tags, and only generate a changelog of full releases.
All this would take is for there to be an argument like --ignore-pre-release which would just not check tags with a - in it, when looking back to the previous tag.