update supported django and python version
update supported django and python version

django-extensions/django-extensions,jpadilla/django-extensions,kevgathuku/django-extensions,dpetzold/django-extensions,kevgathuku/django-extensions,haakenlid/django-extensions,django-extensions/django-extensions,jpadilla/django-extensions,dpetzold/django-extensions,kevgathuku/django-extensions,haakenlid/django-extensions,jpadilla/django-extensions,django-extensions/django-extensions,linuxmaniac/django-extensions,dpetzold/django-extensions,haakenlid/django-extensions,linuxmaniac/django-extensions,linuxmaniac/django-extensions