fix cs

Author: TomasVotruba

Diff for: src/Ast/BaseNode.php

@@ -9,6 +9,7 @@ abstract class BaseNode implements Node
 	private $attributes = [];
 
 	/**
+	 * @param string $key
 	 * @param mixed $value
 	 */
 	public function setAttribute(string $key, $value): void