Log Message:
py-django2: updated to 2.0.6

2.0.6:
Bugfixes
* Fixed a regression that broke custom template filters that use decorators
* Fixed detection of custom URL converters in included patterns
* Fixed a regression that added an unnecessary subquery to the GROUP BY
  clause on MySQL when using a RawSQL annotation.
* Fixed WKBWriter.write() and write_hex() for empty polygons on
  GEOS 3.6.1+.
* Fixed a regression in Django 1.10 that could result in large memory usage
  when making edits using ModelAdmin.list_editable