Merge branch 'bump-django-cors-headers' into 'master'

Bump Python requirement django-cors-headers to 3.5.0

See merge request !975

requirements.txt

@@ -10,7 +10,7 @@ channels-redis==2.4.1
 chardet==3.0.4
 django-admin-hstore-widget==1.1.0
 django-cachalot==2.3.1
-django-cors-headers==3.4.0
+django-cors-headers==3.5.0
 django-enumfields==2.0.0
 django-redis==4.12.1
 djangorestframework==3.11.1