bug 1399639: Update django-tidings
bug 1399639: Update django-tidings

* django-tidings 1.1 → 2.0: Support Django 1.9 to 2.0, Celery 4.x,
  non-pickle serializer.

jwhitlock/kuma,Elchi3/kuma,a2sheppy/kuma,SphinxKnight/kuma,jwhitlock/kuma,jwhitlock/kuma,a2sheppy/kuma,mozilla/kuma,a2sheppy/kuma,jwhitlock/kuma,Elchi3/kuma,SphinxKnight/kuma,SphinxKnight/kuma,escattone/kuma,mozilla/kuma,SphinxKnight/kuma,mozilla/kuma,Elchi3/kuma,a2sheppy/kuma,mozilla/kuma,SphinxKnight/kuma,escattone/kuma,a2sheppy/kuma,escattone/kuma,mozilla/kuma,SphinxKnight/kuma,Elchi3/kuma,jwhitlock/kuma,Elchi3/kuma