bug 1467532: Update to Django 1.11.15
bug 1467532: Update to Django 1.11.15

* Django 1.11.13 → 1.11.15: Mitigate open redirect risk with CommonMiddleware

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