Aa-bulletin-board

Fixed

- An issue where JavaScript and CSS could have been posted in a bulletin
- An issue with unicode characters in bulletin topics

Added

- Group restrictions to bulletins. Bulletins can now be restricted to one or more
groups. Bulletins without group restrictions can be viewed by everyone who has
access to the bulletins.

Fixed

- Small logic error in JavaScript

Fixed

- Key in setup.py

Changed

- Configuration instructions in README.md to make it easier to understand if you
have multiple apps that use CKEditor, like `aa-forum`, and how to combine these
configurations

Changed

- CKEditor config changed to prevent possible collisions in static files (see
[Readme](https://github.com/ppfeufer/aa-bulletin-board/blob/master/README.md) for
details)

Added

- Full example for `CKEDITOR_CONFIGS` to README.md

Changed

- Compatibility with Python 3.9 and Django 3.2 confirmed