be careful about whether USE_TZ exists
be careful about whether USE_TZ exists

should fix github issue #13

zoten/django-axes,SteveByerly/django-axes,django-pci/django-axes,SteveByerly/django-axes,svenhertle/django-axes,grue/django-axes,nidhi-delhivery/django-axes,jazzband/django-axes