Copyright for python-jujuclient source package in Focal

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0
Upstream-Name: Python Juju Client
Source: https://launchpad.net/python-jujuclient

Files: *
Copyright: 2013, Kapil Thangavelu 
License: GPL-3

Files: debian/*
Copyright: 2013, Canonical Ltd (http://www.canonical.com)
License: GPL-3

License: GPL-3
  On Debian GNU/Linux system you can find the complete text of the
  GPL-3 license in '/usr/share/common-licenses/GPL-3'