requirements: disallow upgrade to Django 1.9
requirements: disallow upgrade to Django 1.9

Only allow Django versions between [1.8, 1.9).

swcarpentry/amy,vahtras/amy,wking/swc-amy,shapiromatron/amy,vahtras/amy,pbanaszkiewicz/amy,shapiromatron/amy,swcarpentry/amy,wking/swc-amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy,wking/swc-amy,shapiromatron/amy,vahtras/amy,swcarpentry/amy,wking/swc-amy