Copyright for r-cran-ddrtree source package in Oracular

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: DDRTree
Upstream-Contact: Xiaojie Qiu 
Source: https://cran.r-project.org/package=DDRTree

Files: *
Copyright: 2015-2017 Xiaojie Qiu, Cole Trapnell, Qi Mao, Li Wang
License: Artistic-2.0

Files: debian/*
Copyright: 2020 Andreas Tille 
License: Artistic-2.0

License: Artistic-2.0
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