We were installing the master branch of django-evolution for development
environments, for the sake of unit tests. This could end up conflicting
with the consuming application's version. We now depend on the current
version or newer. Since django-evolution has historically been
backwards-compatible, this range will suffice for now.

Ran pip install -r dev-requirements.txt in a new virtualenv, and

verified that it fetched the latest stable django_evolution.