Add Zhengyang to Credit section for the broken url detect tool.

Author: songzy12

about.php

@@ -37,6 +37,7 @@
 		<li>Tedi Heriyanto: " . dvwaExternalLinkUrlGet( 'http://tedi.heriyanto.net/','tedi.heriyanto.net' ) . "</li>
 		<li>Tom Mackenzie</li>
 		<li>Robin Wood: " . dvwaExternalLinkUrlGet( 'https://digi.ninja/','digi.ninja' ) . "</li>
+		<li>Zhengyang Song: " . dvwaExternalLinkUrlGet( 'https://github.com/songzy12/','songzy12' ) . "</li>
 	</ul>
 	<ul>
 		<li>PHPIDS - Copyright (c) 2007 " . dvwaExternalLinkUrlGet( 'https://github.com/PHPIDS/PHPIDS', 'PHPIDS group' ) . "</li>