Added some protocol changes for 1.16.200 which were previously overlooked.
Player XUIDs are now tracked. If a player's XUID does not match the previously recorded XUID when they next join the server, they will be kicked. This can be disabled by the setting in .player.verify-xuidpocketmine.yml
BUILDING.md now has a note about 's compression bug (a bug in PHP).build/server-phar.php