20.2.0
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
pre-commit autoupdate
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
Ignore inherited field when comparing Attributes (#684)
NG: make frozen classes comfortably subclassable (#687)
Don't reset custom __setattr__ in slotted classes (#681)
Add control to generate __[sg]etstate__ (#642)
Make `zope` a semi-optional test dependency (#685)
Rename _version.py into _version_info.py
Add attr.field (#669)
Fix attribute collection (#635)