Update tests to support Django versions 3.1 and 3.2.

[YPCrumble]

Supports Python versions 3.5 - 3.9.
Fixes #44.

[peterbe]

Can you merge in the latest upstream master into this branch now that #48 has landed.

[YPCrumble]

Will do! I only have one version of python installed in my virtualenv locally so wanted to use CI to run the tests anyway - thank you for #48 !

[YPCrumble]

@peterbe looks like I need approval to get the workflow to run? If the tests don't pass I can take a look at what updates need making later this afternoon.

[YPCrumble]

@peterbe CI passed but it appears the tests aren't running properly - on my local I get output like Ran 18 tests in xxxx seconds OK and that doesn't seem to be showing up in CI - also the CI suite appears to be running way too quickly to be actually running the tests.

[peterbe]

I created a virtualenv, locally, based on Py 3.8. Now I can type:

pip install -U pip wheel tox
tox -e py38-dj22

and then all tests pass. And it says Ran 18 tests in 0.024s.

But if I type:

py38-dj32

tests fail. And that's where your challenge starts :)

[peterbe]

As of #49 try to merge in master again and retry.

[YPCrumble]

@peterbe apparently I still need approval for the workflow to rerun :/.

[YPCrumble]

@peterbe looks like they're running on my fork and failing so I can dig in and fix those issues and will ping you when I need that approval!

[YPCrumble]

@peterbe would you approve the workflow? Seems there was only one small fix to make things work for Django 3.1 and 3.2, and then another to make PyPy tests work. I believe this should pass CI!

[peterbe]

@peterbe would you approve the workflow? Seems there was only one small fix to make things work for Django 3.1 and 3.2, and then another to make PyPy tests work. I believe this should pass CI!

Now you're no longer a first-time contributor! Thanks!