HOWTO Release

1. Update version in docs: https://github.com/satellogic/telluric/blob/master/docs/source/conf.py and in the Changelog, including the date
2. git commit -m 'Bump version' directly on master branch
3. git tag -a vX.Y.Z, and Version X.Y.Z in the tag message (versioneer takes care of the rest)
4. Check that there are no leftover files (git clean -i or cd .. && git clone telluric telluric-clean)
5. pip install -U twine build if needed
6. Generate sdist and bdist_wheel: python -m build .
7. Upload to test environment to see that everything works: twine upload dist/* --repository-url https://test.pypi.org/legacy/ (note: if there are old releases in dist/*, twine will complain)
8. If everything is correct, upload to production environment: twine upload dist/* --repository-url https://upload.pypi.org/legacy/
9. git push upstream master && git push upstream --tags
10. "Draft a new release" https://github.com/satellogic/telluric/releases/new
11. Advance version in docs/source/conf.py to vX.Y+1.dev0 and git commit -m 'Bump to next development version'
12. Send an email to https://mail.python.org/mailman/listinfo/python-announce-list about the new release, similar to https://mail.python.org/pipermail/python-announce-list/2018-April/011908.html