Declare Django versions in install_requires (#7063)
Declare Django versions in install_requires (#7063)

* Declare Django versions in install_requires

Pip's dependency resolver (used in pipenv, pip-compile, poetry, etc.) can use this to infer whether there's a verison collision in what it's being asked to install or not.

* No max

tomchristie/django-rest-framework,tomchristie/django-rest-framework,tomchristie/django-rest-framework