Update docs to reflect Django 3 support
Supported Django and Python versions updated based on recent commit history and most recent Travis CI builds.
@@ -55,8 +55,8 @@ Features
Dependencies & Compatibility
============================
- * Django 2.0
- * Python 3.5, 3.6
+ * Django 2.0 or 3.0
+ * Python 3.6, 3.7, 3.8
* `django-mptt <https://github.com/django-mptt/django-mptt>`_ is needed
* `django-taggit if needed <https://github.com/alex/django-taggit>`_ (if PAGE_TAGGING = True)
* `django-haystack if needed <http://haystacksearch.org/>`_
