Add myself to manual authors.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275199 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/credits.html

@@ -27,6 +27,7 @@
   <li>Bill Kelly (<a href="mailto:bill.kelly@softwired-inc.com">bill.kelly@softwired-inc.com</a>)</li>
   <li>Arnout J. Kuiper (<a href="mailto:ajkuiper@wxs.nl">ajkuiper@wxs.nl</a>)</li>
   <li>Conor MacNeill</li>
+  <li>Jan Matèrne</li>
   <li>Stefano Mazzocchi (<a href="mailto:stefano@apache.org">stefano@apache.org</a>)</li>
   <li>Erik Meade (<a href="mailto:emeade@geekfarm.org">emeade@geekfarm.org</a>)</li>
   <li>Sam Ruby (<a href="mailto:rubys@us.ibm.com">rubys@us.ibm.com</a>)</li>
@@ -50,4 +51,4 @@ $Id$</p>
 Reserved.</p>
 
 </body>
-</html>
+</html>