Added Tristan Wibberley to contributors.

Added Tristan Wibberley to contributors.

--- a/CONTRIBUTORS	Sat Aug 06 21:58:28 2005 +0100
+++ b/CONTRIBUTORS	Sat Aug 06 21:59:22 2005 +0100
@@ -24,6 +24,7 @@
 Andrew Thompson <andrewkt at aktzero.com>
 Michael S. Tsirkin <mst at mellanox.co.il>
 Rafael Villar Burke <pachi at mmn-arquitectos.com>
+Tristan Wibberley <tristan at wibberley.org>
 Mark Williamson <mark.williamson at cl.cam.ac.uk>
 
 If you are a contributor and don't see your name here, please let me know.