Does not support Django 3

[ianhco]

Since Django 3, support for template tag admin_tag has been dropped, needs to be replaced by static. Also the models registered on admin.py is not correctly shown on the admin page

[wadewilliams]

The code is merged in #12 but pip is not updated; although the same error still occurs if you install from git.

[KayvanMazaheri]

Same problem here.

TemplateSyntaxError: 'admin_static' is not a registered tag library.

It seems the changes weren't released on PyPi.
The most recent release (0.2) was published on Jun 1, 2017 and still uses the static_admin.

@volrath