Installation error on 0.11.x

[EvanCarroll]

When I run python3 ./setup.py install, I'm getting this error

error: Django 2.2.28 is installed but Django>=3.2 is required by {'django-picklefield'}

This makes sense, in __init__.py, we have

'django': 'django>=1.11,<3.0',
....
'picklefield': 'django-picklefield>=1.0.0'

So we need to be more specific what version of django-picklefield we require in 0.11.x

[evgenyfadeev]

@EvanCarroll could you give it (the master branch) a shot now?
I've merged the big upgrade branch theme-cleanup - I'm already using it in production, hopefully it works for you as well.