🚜 Migrate to django-fsm-2

[jefftriplett]

I recently switched to https://pypi.org/project/django-fsm-2/, and dropping the django_fsm setup requirement would still allow other spiritual successor projects to work.
https://github.com/jazzband/django-fsm-log/blob/master/setup.py#L22

I'm happy to create a new issue and submit a PR if this is helpful?

[lorenzomorandini]

Fine for me, since django-fsm (1) won't be updated anymore I don't see a reason to keep it as dependency. Still we should consider to document this, especially if django-fsm-2 will ever introduce breaking changes with django-fsm.

[pfouque]

especially if django-fsm-2 will ever introduce breaking changes with django-fsm.

That's not the plan! ;)
The main idea is to keep publishing releases according to Python & Django version upgrades.
I may add type hints at some point, but feature-wise, the scope is complete IMO!