Pillow: Release Pillow 8.1.0 on January 2, 2021

[hugovk]

Add release notes:

• [x] https://github.com/python-pillow/pillow-wheels/pull/175

Main Release

Released quarterly on January 2nd, April 1st, July 1st and October 15th.

• [x] Open a release ticket e.g. https://github.com/python-pillow/Pillow/issues/3154
• [x] Develop and prepare release in master branch.
• [x] Check GitHub Actions and AppVeyor to confirm passing tests in master branch.
• [x] Check that all of the wheel builds Pillow Wheel Builder pass the tests in Travis CI and GitHub Actions.
• [x] In compliance with PEP 440, update version identifier in src/PIL/_version.py
• [x] Update CHANGES.rst.
• [x] Run pre-release check via make release-test in a freshly cloned repo.
• [x] Create branch and tag for release e.g.:
  bash git branch 5.2.x git tag 5.2.0 git push --all git push --tags
• [x] Create and check source distribution:
  bash make sdist twine check dist/*
• [x] Create binary distributions
• [x] Check and upload all binaries and source distributions e.g.:
  bash twine check dist/* twine upload dist/Pillow-5.2.0*
• [x] Publish the release on GitHub
• [x] In compliance with PEP 440, increment and append .dev0 to version identifier in src/PIL/_version.py

Binary Distributions

Windows

• [x] Contact @cgohlke for Windows binaries via release ticket e.g. https://github.com/python-pillow/Pillow/issues/1174.
• [x] Download and extract tarball from @cgohlke and copy into dist/

Mac and Linux

• [x] Use the Pillow Wheel Builder:
  bash git clone https://github.com/python-pillow/pillow-wheels cd pillow-wheels ./update-pillow-tag.sh [[release tag]]
• [x] Download wheels from the Pillow Wheel Builder release
  and copy into dist/

Publicize Release

• [x] Announce release availability via Twitter e.g. https://twitter.com/PythonPillow/status/1013789184354603010

Documentation

• [x] Make sure the default version for Read the Docs is up-to-date with the release changes

Docker Images

• [x] Update Pillow in the Docker Images repository
  bash git clone https://github.com/python-pillow/docker-images cd docker-images ./update-pillow-tag.sh [[release tag]]

[radarhere]

Add release notes:

• [x] python-pillow/pillow-wheels#175

Ok, I've created #5133

[hugovk]

@radarhere Are you up for this one?

[radarhere]

@hugovk sure, I can do that. Would you mind merging in the security-related items first? You've been more across that than I have.

[radarhere]

@wiredfool should I continue going ahead with this release, or wait for #5062?

[wiredfool]

I would have liked #5602 to get in, because I think it's potentially a fix for a pretty serious issue, but we are looking at sending a pretty significant change out without decent smoke testing there.

[radarhere]

Thanks.

@cgohlke could we have Windows binaries for 8.1.0?

[nulano]

One significant change in #5062, if/when it makes it in, is that it removes support for dynamically loading Raqm, which will require all Windows users to switch from installing libraqm.dll to fribidi.dll.

[radarhere]

Thanks.

And we're done - https://twitter.com/PythonPillow/status/1345465680028569600