bug 1399639: Upgrade to Django 1.8.19
bug 1399639: Upgrade to Django 1.8.19

* Django 1.8.18 → 1.8.19: Security release, mitigate denial-of-service
  attacks against catastrophic backtracking vulnerability in
  regular expressions. One of the affected functions (truncatechars) is
  used in the Django admin.

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