Feature fixed on v2.4:
  * correctly retrieve account information when it was already registred (afb7e988)
  * when DNS Host configuration is an IP address, use it correctly as name server (2776348a)
  * improve code stability by following hints from [pyright](https://github.com/microsoft/pyright)
    (raises more explicit errors, fix function return type...)

Continuous Integration:
  * Remove tests for Debian Jessie and add tests for Debian Bullseye (a745e655)
  * Validate all tests with the [pebble](https://github.com/letsencrypt/pebble) tiny ACME server

Documentation:
  * Move documentation from wiki to [`/documentations`](./documentations) directory so we can always synchronize it with code
This tag has no release notes.