Switch to new contact address in copyright comments.

--HG--
branch : HEAD
diff --git a/lib/zip.h b/lib/zip.h
index 9d0d700..adbcbd3 100644
--- a/lib/zip.h
+++ b/lib/zip.h
@@ -6,7 +6,7 @@
   Copyright (C) 1999-2007 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