Django 1.9: latest django-comments for app_label issue

We need
django/django-contrib-comments@53e0516
to resolve app_label issue in Django comments

Author: dwaynebailey

requirements/base.txt

@@ -6,7 +6,7 @@ Django>=1.9.9,<1.10
 django-allauth==0.25.2
 django-assets==0.11
 django-contact-form==1.2
-django-contrib-comments==1.7.1
+django-contrib-comments==1.7.2
 #django-overextends==0.4.1
 -e git://github.com/stephenmcd/django-overextends.git#egg=django-overextends
 django-redis==4.4.3