Copyright for golang-siphash-dev source package in Bionic

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: siphash
Upstream-Contact: Dmitry Chestnykh 
Source: https://github.com/dchest/siphash

Files: *
Copyright: © 2012-2013 Dmitry Chestnykh 
License: CC0

Files: debian/*
Copyright: © 2014 Jérémy Bobbio 
License: CC0

License: CC0
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