Disable pandas while we look into psf#2193 (psf#2195)

Elaborate on what AST changes Black might perform

Elaborate on what AST changes Black might perform

Update CHANGELOG for 21.4b1 release (psf#2151)

* Update CHANGELOG for 21.4b1 release

* Add pathspec minimum bump + update primer not to expect changes for virtualenv

Update CHANGES.md for release (psf#2129)

v20.8b1 - now with Click 7

v20.8b0 - August 26

Hopefully last beta!

Remove Poetry metadata

v19.3b0

v18.9b0