custom Django field for easy use of markup in text fields (Python3 version)

 An implementation of a custom MarkupField for Django. A MarkupField is in
 essence a TextField with an associated markup type. The field also caches
 its rendered value.
 .
 It supports these markup types by default:
  * html: allows HTML, potentially unsafe
  * plain: plain text markup, calls urlize and replaces text with linebreaks
 And these markups if the appropriate Python module is installed:
  * markdown: default markdown renderer (requires python-markdown)
  * restructuredtext: default ReST renderer (requires python-docutils)
  * textile: default textile renderer (requires python-textile)
 .
 This package contains the Python 3 version of the library.