Creating a new release (GitHub and PyPi)

1. Ensure you are on master: $ git checkout master
2. Ensure you are using the latest copy of master: $ git pull origin master
3. Check for any local changes to master: $ git status - test locally and push if necessary.
4. Check that GitHub Actions Python CI for master is passing.
5. Find changes since last version release: see list of commits.
6. Summarise these changes in docs/source/changelog.rst
7. Commit with a message e.g. Release v1.3
8. Tag with the same message e.g. git tag v1.3
9. Push to github - first the commit: git push origin master
10. ..and then push the new tag: git push origin tag v1.3
11. Create a universal wheel: python setup.py bdist_wheel --universal
12. This will put a new wheel file in dist/
13. Also create a source distribution: python setup.py sdist
14. This will put a source distribution archive in dist/
15. Upload all the new distribution release files (wheel and archive) to PyPI: twine upload -u USERNAME -p PASSWORD dist/file
16. Create a new GitHub release - https://github.com/kinverarity1/lasio/releases/new - select the tag, and copy the CHANGELOG text in.
17. Copy the wheel and source distribution archive files into the release page.
18. Publish the release.

That's it.