Create 3.0 release

[sergei-iurchenko]

Let`s create 3.0 release. There are a lot of changes, refactorings, some of them are incompatible.
I have tested from develop branch in my projects and it works good.
I am ready to assist if new bugs appear
@camilonova

[camilonova]

pypi build is not happy about it https://github.com/jazzband/django-constance/actions/runs/5394515587/jobs/9795898856

@sergei-iurchenko can you help?

[DrMeers]

Seems to be this issue @camilonova : django/asgiref#393

[sergei-iurchenko]

Sorry for delay.
What do you think about removing pypy support? #524
It is actually used only for dj 3.2

[camilonova]

What's next?

[sergei-iurchenko]

Let's do it)

[felippem]

Let's do it)

Are you working on it?

[sergei-iurchenko]

@camilonova do we still have any blockers?
I could make a release but I don't know how and I suppose I don't have enough permissions.

[camilonova]

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