setup: Limit django-registration-redux to < 1.5
setup: Limit django-registration-redux to < 1.5

It seems that django-registration-redux 1.5 doesn't work with Shuup yet.

See e.g.:

https://travis-ci.org/shuup/shuup/jobs/219342597

shoopio/shoop,suutari-ai/shoop,shoopio/shoop,shoopio/shoop,suutari-ai/shoop,suutari-ai/shoop