Update maintainer email

debian/control

@@ -1,7 +1,7 @@
 Source: libqtxdg
 Maintainer: LXQt Packaging Team <pkg-lxqt-devel@lists.alioth.debian.org>
 Uploaders: Alf Gaida <agaida@siduction.org>,
-           ChangZhuo Chen (陳昌倬) <czchen@gmail.com>,
+           ChangZhuo Chen (陳昌倬) <czchen@debian.org>,
            Andrew Lee (李健秋) <ajqlee@debian.org>
 Section: libs
 Priority: optional

debian/copyright

@@ -12,7 +12,7 @@ Copyright: 2013 Digia Plc and/or its subsidiary(-ies)
 License: LGPL-2.1-or-3-with-Digia-1.1-exception
 
 Files: debian/*
-Copyright: 2014-2015 ChangZhuo Chen (陳昌倬) <czchen@gmail.com>
+Copyright: 2014-2015 ChangZhuo Chen (陳昌倬) <czchen@debian.org>
            2013-2015 Alf Gaida <agaida@siduction.org>
 	   2015      Andrew Lee (李健秋) <ajqlee@debian.org>
 License: LGPL-2.1+