Added 'six' to package requirements
Added 'six' to package requirements

Zowie/django-htmlmin,Zowie/django-htmlmin,cobrateam/django-htmlmin,erikdejonge/django-htmlmin,cobrateam/django-htmlmin,Alcolo47/django-htmlmin,Alcolo47/django-htmlmin,erikdejonge/django-htmlmin,erikdejonge/django-htmlmin