Require django-pyscss 1.0.1 for django-compressor 1.4 support

Since django-compressor 1.4 changed the parameters for its filter
class, we need a newer version of django-pyscss that takes that
change into consideration.

This is needed for patch https://review.openstack.org/#/c/90371/

Change-Id: Ie2389fa60ee5c60689e55f193ebbbd57b1c9959d
Partial-implements: blueprint bootstrap-update
Merge "Require django-pyscss 1.0.1 for django-compressor 1.4 support"