Copyright for powerstat source package in Stretch

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: powerstat
Upstream-Contact: Colin King 
Source: git://kernel.ubuntu.com/cking/powerstat.git

Files: *
Copyright: 2011-2016, Canonical Ltd
License: GPL-2+
 On Debian systems, the complete text of the GNU General Public
 License can be found in `/usr/share/common-licenses/GPL-2'.