fix(setup): avoid binary string literal prefix
fix(setup): avoid binary string literal prefix

Not supported in python 3 versions, see travis error here:
https://travis-ci.org/modlinltd/django-advanced-filters/jobs/117396345

dsanders11/django-advanced-filters,modlinltd/django-advanced-filters,dsanders11/django-advanced-filters,modlinltd/django-advanced-filters,modlinltd/django-advanced-filters,dsanders11/django-advanced-filters,PreppyLLC-opensource/django-advanced-filters,PreppyLLC-opensource/django-advanced-filters,PreppyLLC-opensource/django-advanced-filters,dsanders11/django-advanced-filters