Add django-wiki (#844)

* Add django-wiki

* Remove full stop after Demo link.

README.md

@@ -1065,6 +1065,7 @@ See also [Documentation Generators](#documentation-generators), [Wikimatrix](htt
 
   * [Blazekiss](http://projet.idleman.fr/blazekiss/) - BlazeKiss is a KISS-based wiki (Keep It Simple, Stupid) - simplicity and functionality comes before all. ([Source Code](https://github.com/ldleman/blazekiss)) `GPLv3` `PHP`
   * [BookStack](https://www.bookstackapp.com/) - BookStack is a simple, self-hosted, easy-to-use platform for organizing and storing information. It allows for documentation to be stored in a book like fashion. ([Demo](https://www.bookstackapp.com/#demo), [Source Code](https://github.com/ssddanbrown/BookStack)) `MIT` `PHP`
+  * [django-wiki](https://github.com/django-wiki/django-wiki) - A wiki system with complex functionality for simple integration and a superb interface. Store your knowledge with style: Use django models. ([Demo](https://demo.django.wiki/)) `GPLv3` `Python`
   * [Dokuwiki](https://www.dokuwiki.org/DokuWiki) - An easy to use, lightweight, standards-compliant wiki engine with a simple syntax allowing reading the data outside the wiki. All data is stored in plain files, therefore no database is required. `GPL` `PHP`
   * [Gitit](https://github.com/jgm/gitit) - A wiki program that stores pages and uploaded files in a git repository, which can then be modified using the VCS command line tools or the wiki's web interface. ([Demo](http://gitit.johnmacfarlane.net/)) `GPLv2` `Haskell`
   * [Gollum](https://github.com/gollum/gollum) - A simple, Git-powered wiki with a sweet API and local frontend. `MIT` `Ruby`