Deprecate 'Choices'

[adamchainz]

Problem

Django 3.0 adds enumeration types, which perform the same function as the Choices class. It's best we recommend users use the core django feature rather than duplicating it

PR #421 added a note about this.

At least once the minimum Django version is 3.0, we should deprecate Choices and remove it some time after.

See also my blog post.

[lifelonglearner127]

Yes. But Django 3.0 does not support named group, whereas django-model-utils does.

[adamchainz]

Yes that's fair. There was a discussion on django-developers to add support, it should come in a future Django version I expect.