Add int hint to Mastodon V2 UserStats.php

src/Object/Api/Mastodon/InstanceV2/UserStats.php

@@ -33,10 +33,10 @@ class UserStats extends BaseDataTransferObject
 	/** @var int */
 	protected $active_month = 0;
 
-	/**
-	 * @param $active_month
-	 */
-	public function __construct($active_month)
+    /**
+     * @param int $active_month
+     */
+    public function __construct(int $active_month)
 	{
 		$this->active_month = $active_month;
 	}