Remove memory addresses from documentation in django-celery

[Preston Moore]

Hey everyone,

I’ve worked with the people at the Celery project to merge a fix for memory addresses being included in the documentation for the django-celery package. (https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/django-celery.html).  The fix changes the string representation of their app object so Sphinx can recognize and strip the address (due to a fix put in place here:https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=822197).

Thanks,
Preston Moore