Update copyright

debian/copyright

@@ -4,7 +4,7 @@ Source: https://github.com/qterminal/qtermwidget
 
 Files: *
 Copyright: Copyright (C) 2000 by Stephan Kulow <coolo@kde.org>
-           Copyright (C) 2008 e_k (e_k@users.sourceforge.net) 
+           Copyright (C) 2008 e_k (e_k@users.sourceforge.net)
            Copyright 2007-2008 by Robert Knight <robertknight@gmail.com>
            Copyright 1997,1998 by Lars Doelle <lars.doelle@on-line.de>
 License: GPL-2+
@@ -27,6 +27,7 @@ Files: debian/*
 Copyright: 2012-2015 Alf Gaida <agaida@siduction.org>
 	   2012      Thorsten Wohlfarth <towo@siduction.org>
            2012      Henson Sturgill <daddysturg@gmail.com>
+           2015      ChangZhuo Chen (陳昌倬) <czchen@gmail.com>
 License: GPL-3+
 
 License: LGPL-2+