CHANGELOG
* Support already valid authorizations (pull #254)
* Moved to Github Actions workflows for automated tests, started using Let's Encrypt pebble test server, increased test coverage to 100% (pull #265)
* Added test to ensure path traversal can't be exploited (issue #262, pull #266)
* Started logging Account IDs for later reference (pull #260)
* Various README updates (pull #249, pull #257)