Copyright for md4c source package in Huanghe V3.0

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: md4c
Source: https://github.com/mity/md4c

Files: *
Copyright: 2016-2020 Martin Mitáš
License: Expat

Files: debian/*
Copyright: 2019 Lisandro Damián Nicanor Pérez Meyer 
License: Expat

Files: md2html/cmdline.c
       md2html/cmdline.h
Copyright: 2006 Brian Raiter
License: public-domain
 This code is in the public domain.

Files: test/*
Copyright: 2014 John MacFarlane
License: BSD-2-clause

Files: test/spec.txt
Copyright: 2014 John MacFarlane
License: CC-BY-SA-4.0

License: Expat
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