Copyright for libtree-r-perl source package in Bionic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Tree-R
Source: https://metacpan.org/pod/Tree::R

Files: *
Copyright: 2005- Ari Jolma 
License: Artistic-2.0

Files: debian/*
Copyright: 2017 Francesco Paolo Lovergine 
License: Artistic-2.0

License: Artistic-2.0
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