Added Lauri Kasanen to the CREDITS for a last-minute 2.0.3 patch.

CREDITS.txt

@@ -106,6 +106,9 @@ OS/2 updates:
 Bug fixes:
     Patrice Mandin
 
+Bug fixes:
+    Lauri Kasanen
+
 Other stuff:
     Your name here! Patches go to icculus@icculus.org ...