Hypothesis has an automated release flow:

Once you’ve written a release file and the pull request is merged into master, and after all the other tests have passed, our CI uses this file to create a new release.First, it works out the new version number, and updates it in version.py. Then it copies the release description into the changelog, including the new version number and the current date.

Nice.

http://hypothesis.works/articles/continuous-releases/