Bugfix and Python 3.9 support v2.5.2

Bugfix release v2.5.1

Release v2.5.0

First release candidate of 2.5

Bump version to 2.4.0

Update .gitignore

Bump version: 2.3.0.dev1 → 2.3.0 release

Update CHANGELOG for v2.2.2

Bump version to v2.2.1

Prior v2.2.0 release blocked upload.

Update setup.py