Update Django versions in horizon requirements
Part of blueprint django2-support
@@ -4,11 +4,14 @@ System Requirements
The Queens release of horizon has the following dependencies.
-* Python 2.7
-* Django 1.11
+* Python 2.7 or 3.5
+* Django 1.11 or 2.0
- * Django 1.8 to 1.10 are also supported.
- Their support will be dropped in the Rocky release.
+ * Django 1.8 to 1.10 are no longer supported since Rocky release.
+ * Horizon usually syncs with
+ `Django's Roadmap <https://www.djangoproject.com/weblog/2015/jun/25/roadmap/>`__
+ and basically supports maintained versions of Django
+ as of the feature freeze of each OpenStack release.
* An accessible `keystone <https://docs.openstack.org/keystone/latest/>`_ endpoint
