Switch to new contact address in copyright comments.

--HG--
branch : HEAD
diff --git a/lib/zip_set_archive_comment.c b/lib/zip_set_archive_comment.c
index a2286e8..343fa54 100644
--- a/lib/zip_set_archive_comment.c
+++ b/lib/zip_set_archive_comment.c
@@ -3,7 +3,7 @@
   Copyright (C) 2006-2007 Dieter Baron and Thomas Klausner
 
   This file is part of libzip, a library to manipulate ZIP archives.
-  The authors can be contacted at <nih@giga.or.at>
+  The authors can be contacted at <libzip@nih.at>
 
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions