* Fix a comment block disabling incorrectly RST form for cachalot_disabled
* Update CHANGELOG.rst
* Several points did I incorrectly say that 50 modifications per second was too much. It was supposed to say minute. You'd have to have a LARGE website to really get to that point since inserts from an external DB would typically take a 250-1000ms/1s per INSERT/UPDATE
* Add Python 3.9 support in the docs and setup.py
* Move chat to Discord and reflect in the docs