fix Django 1.10 warning - get_field_by_name -> get_field
fix Django 1.10 warning - get_field_by_name -> get_field

savoirfairelinux/django-smart-selects,savoirfairelinux/django-smart-selects,knixeur/django-smart-selects,digi604/django-smart-selects,johtso/django-smart-selects,digi604/django-smart-selects,knixeur/django-smart-selects,johtso/django-smart-selects