Support Django 3.2

[allanlewis]

This project currently declares support for Django 3 up to 3.1: it would be great if it could also officially support 3.2, since that's now the latest LTS version.

[AlexDaniel]

Don't know if it's the same issue, but lately I started getting this:

Resolving dependencies...

  SolverProblemError

  Because djoser (2.1.0) depends on djangorestframework-simplejwt (>=4.3.0,<5.0.0)
   and no versions of djoser match >2.1.0,<3.0.0, djoser (>=2.1.0,<3.0.0) requires djangorestframework-simplejwt (>=4.3.0,<5.0.0).
  So, because mycoolproject depends on both djangorestframework-simplejwt (^5.0.0) and djoser (^2.1.0), version solving failed.