Copyright for dustmite source package in Focal

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: dustmite
Upstream-Contact: Vladimir Panteleev
Source: https://github.com/CyberShadow/DustMite

Files: *
Copyright: 2011-2016, Vladimir Panteleev 
License: public-domain
 "DustMite was created by Vladimir Panteleev
 and is released into the Public Domain."