added a breaking note for custom addons to the CHANGELOG
added a breaking note for custom addons to the CHANGELOG

With the movement of all the function from the boot.php into fitting classes
custom addons will break (e.g. local_user() calls). The note in the CHANGELOG
should be a warning and a reminder for the release notes of 2022.12.

friendica/friendica,annando/friendica,annando/friendica,annando/friendica,friendica/friendica,friendica/friendica,friendica/friendica,annando/friendica,annando/friendica,friendica/friendica