Attempt to fix daphne transparently not sending group messages.

app/requirements.txt

@@ -2,18 +2,18 @@
 git+https://github.com/celery/kombu.git@4.6.6#egg=kombu
 git+https://github.com/celery/celery.git@4.4.0rc4#egg=celery
 Pillow>=5.4.1
-Django==2.1.4
+Django>=2.2,<3
 redis==3.2.1
 uwsgi==2.0.17
-daphne==2.2.0  # dependency conflict, remove once https://github.com/django/channels/pull/1278 is merged
-channels==2.1.7
-channels-redis==2.3.1
+daphne==2.5.0
+channels==2.4.0
+channels-redis==3.2.0
 django-redis==4.10.0
 psycopg2-binary==2.7.6
 django-ordered-model==3.1.1
 easy-thumbnails==2.5
 git+https://github.com/mittagessen/kraken.git@3.0b17#egg=kraken
-django-cleanup==3.0.1
+django-cleanup==5.1.0
 djangorestframework==3.9.2
 drf-nested-routers==0.91
 bleach==3.1.5