20.1.0
Move test helpers into an utils module
Tune down strategies a bit
Add attr.resolve_types (#302)
Check type of set_run_validators' arg
Rename converters.chain to converters.pipe
Add on_setattr hooks to attr.s and attr.ib (#660)
Fade to Black (#392)
Split cmp into eq and order (#574)
Clear __setattr__ if it was inherited && written by us (#663)
Be consistent in calling slotted classes slotted
Add attr.field (#669)
Add control to generate __[sg]etstate__ (#642)
Fix simple typo: passses -> passes (#601)
Rename _version.py into _version_info.py
Fix attribute collection (#635)