Patch 1

plugin.yml

@@ -1,5 +1,5 @@
 main: aliuly\manyworlds\Main
-api: 2.0.0
+api: 3.0.0-ALPHA10, 3.0.0-ALPHA11
 load: POSTWORLD
 
 name: ManyWorlds

src/aliuly/manyworlds/Main.php

@@ -72,7 +72,7 @@ public function autoLoad(CommandSender $c,$world) {
 	// Command dispatcher
 	//
 	//////////////////////////////////////////////////////////////////////
-	public function onCommand(CommandSender $sender, Command $cmd, $label, array $args) {
+	public function onCommand(CommandSender $sender, Command $cmd, string $label, array $args) : bool{
 		if ($cmd->getName() != "manyworlds") return false;
 		return $this->dispatchSCmd($sender,$cmd,$args);
 	}