www/py-django-tinymce: Update to 3.0.1

• Also assign the port to Django 2.2 because Django 1.11 is End-of-Life since April.

• Although Django 2.2 requires at least Python 3.5 to work the support for that version was dropped with the 3.0.1 release. Hence set the Python version to 3.6.

• Make USES block separate from non-relevant variables.

• Take maintainership.

Changelog:

https://github.com/aljosa/django-tinymce/blob/3.0.1/CHANGELOG.rst

PR: 245659
Approved by: skozlov (maintainer)