Exit code in PhpDoc (#167) [skip ci]

commands/HelloController.php

@@ -23,6 +23,7 @@ class HelloController extends Controller
     /**
      * This command echoes what you have entered as the message.
      * @param string $message the message to be echoed.
+     * @return int Exit code
      */
     public function actionIndex($message = 'hello world')
     {