Fixed order of base classes in CBV mixin docs
Merge pull request #1265 from dbrgn/mixin_order

Fixed order of base classes in CBV mixin docs
Fixed #20594 -- Add validation to models.SlugField.

Thanks carbonXT for the report.
Fixed #20000 -- Allowed ModelForm meta overrides for label, help_text and error_messages
Added release notes for auth views being reversed by name, not by path.

Refs #20532
Added a ``checksetup`` management command for verifying Django compatibility.
Remove incorrect CONTENT_TYPE header from GET and HEAD requests
Merge pull request #1270 from tomchristie/remove-incorrect-content-type-test-client

Remove incorrect CONTENT_TYPE header from GET and HEAD requests
Fixed #17076 -- When reversing a URL fails, inform the user which patterns were tried.
Fixed #15273 -- Extend RedirectView to allow reversal by name.

Thanks to @DrMeers for the report and @ludwigkraatz for the initial patch.