Allowing for async checks in fastApi. Cleaning up old code. (mozilla-…

…services#114)

* Allowing for async checks in fastApi. Cleaning up old code. Fixes mozilla-services#106
* Added a few unit tests for fast_api

Update changelog for 2024.4.0 release (mozilla-services#108)

(fastapi) Initialize JsonLogFormatter to pass to handler (mozilla-ser…

…vices#107)

Update changelog 2024.3.0

2022.8.0

- Add support for Sanic 21 and 22, with `aioredis` 2.x
- Add support for Django 4.1
- Add support for Flask 2.2
- Some documentation updates

2022.7.0

* Update supported versions of Python, Django, Flask
* Django: Drop default_app_config

Update changelog for 2022.1.0