Remove remaining references to EOL Django 2.0 and 2.1
Remove remaining references to EOL Django 2.0 and 2.1

These lines were missed in 4858319ed914894e32b8eaf3ae4b59fb5925aa2a.

jdufresne/django-decorator-include,jdufresne/django-decorator-include,twidi/django-decorator-include,twidi/django-decorator-include