Copyright for lftp source package in Bionic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: lftp
Upstream-Contact: Alexander V. Lukyanov 
Source: https://lftp.tech/

Files: *
Copyright: 1996-2017 by Alexander V. Lukyanov 
License: GPL-3
 On Debian systems, the full text of the GNU General Public
 License version 2 can be found in the file
 `/usr/share/common-licenses/GPL-3'.

Files: debian/*
Copyright: 2002-2017 Noël Köthe 
License: GPL-2+
 On Debian systems, the full text of the GNU General Public
 License version 2 can be found in the file
 `/usr/share/common-licenses/GPL-2'.