Django 4.1 incompatibility

[danjac]

Looks like Django 4.1 is incompatible with django-fast-update:

 Because django-fast-update (0.2.0) depends on Django (>=3.2,<4.1)
   and no versions of django-fast-update match >0.2.0,<0.3.0, django-fast-update (>=0.2.0,<0.3.0) requires Django (>=3.2,<4.1).

[jerch]

This is mainly a safety measure, have to test first, if things keep working under django 4.1 and do another release.

Thx for the headsup.

[jerch]

@danjac Updated package version to 0.2.1.