Add FAQ section in README to explain usage of Generics

[browniebroke]

I have made things!

I recently came across the fact that this library adds support for Generics in DRF serializers, which makes type checking a lot better. It might be obvious to the people who are familiar with type checking, but it wasn't obvious to me that this library supported that.

Related issues

Refs #164

Follow up

I think it's also supported for GenericViewSet, but requires a bit more extra setup. If that's correct, I can also add a paragraph/section about that, although I'd like to get feedback on this change first.

[browniebroke]

I think it's also supported for GenericViewSet, but requires a bit more extra setup.

I tried to use it in my project but it didn't work. After a quick search, the monkeypatching might not be working so well for DRF, depending on your DRF settings.

From what I understand, it's not properly fixable in any of the projects from the @typeddjango org, and it should be better once DRF 3.15 is out, which will include this change. I suggest to not advertise this feature for views until 3.15 is out, and it will need a note about the minimum version.

[sobolevn]

Do we have a ETA for the release?

[browniebroke]

There is a PR open to prepare the release notes. It's been open for a while now and it looks like it's all ready, although some more changes have been merged since it was last updated.

Probably just waiting on a maintainer to find enough free time to do it.