Release process

How to make a new release of Annif.

1. Check that the master branch is in shape for a new release - tests are passing, no open issues etc.
2. Make sure your local master branch is up to date w.r.t. GitHub: git checkout master; git pull
3. Activate the pipenv with pipenv shell if you haven't already
4. Make a new version with bumpversion: bumpversion minor or bumpversion patch
5. Push the commit to GitHub: git push
6. Push the version tag too: git push --tags
7. Wait for Travis CI builds to complete. The version tag should trigger a distribution build that is uploaded to PyPI. Also it should trigger archiving on Zenodo.
8. In GitHub Releases tab, turn the tab into a release.