Copyright for pastebinit source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: pastebinit
Upstream-Contact: Stéphane Graber 
Source: https://launchpad.net/pastebinit

Files: *
Copyright: 2007-2016 Stéphane Graber, Daniel Bartlett, David Paleino
License: GPL-2+

Files: debian/
Copyright: 2006-2008 Stéphane Graber
           2008-2018 Rolf Leggewie
           2019 Simon Quigley `/usr/share/common-licenses/GPL-2'.