How to issue an OGGM release.

 1. Go to your local main repository (not the fork) and ensure your master branch is synced:
       git checkout master
       git pull
 2. Look over whats-new.rst and the docs. Make sure "What's New" is complete
    (check the date!) and add a brief summary note describing the release at the
    top. Check index.rst to update the version here as well.
 3. If you have any doubts, run the full test suite one final time!
      pytest --run-slow --mpl .
 4. On the master branch, commit the release in git:
      git commit -a -m 'Release v1.X.Y'
 5. Tag the release:
      git tag -a v1.X.Y -m 'v1.X.Y'
 6. Build source and binary wheels for pypi:
      git clean -xdf  # this deletes all uncommitted changes!
      python -m build
 7. Use twine to register and upload the release on pypi. Be careful, you can't
    take this back!
      twine upload dist/oggm-1.X.Y*
    You will need to be listed as a package owner at
    https://pypi.python.org/pypi/oggm for this to work.
 8. Push your changes to master:
      git push origin master
      git push origin --tags
 9. Update the stable branch (used by ReadTheDocs) and switch back to master:
      git checkout stable
      git rebase master
      git push origin stable
      git checkout master
    It's OK to force push to 'stable' if necessary.
    We also update the stable branch with `git cherrypick` for documentation
    only fixes that apply the current released version.
10. Add a section for the next release (v.X.(Y+1)) to doc/whats-new.rst.
11. Commit your changes and push to master again:
      git commit -a -m 'Revert to dev version'
      git push origin master
    You're done pushing to master!
12. Issue the release on GitHub. Click on "Draft a new release" at
    https://github.com/OGGM/oggm/releases. Type in the version number, but
    don't bother to describe it -- we maintain that on the docs instead.
13. Update the docs. Login to https://readthedocs.org/projects/oggm/versions/
    and switch your new release tag (at the bottom) from "Inactive" to "Active".
    It should now build automatically.
14. Now the containers: run CI on https://github.com/OGGM/r2d to get the correct
    on https://github.com/OGGM/r2d/pkgs/container/r2d. Then update the tag on
    https://github.com/OGGM/binder, in the master and stable branch.
    On https://hub.oggm.org, create a new environment as well.
15. Issue the release announcement!
