Copyright for pytest-xvfb source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: pytest-xvfb
Upstream-Contact: Florian Bruhin 
Source: https://pypi.python.org/pypi/pytest-xvfb/

Files: *
Copyright: 2016 Florian Bruhin
License: Expat

Files: debian/*
Copyright: 2017 Ghislain Antony Vaillant 
License: Expat

License: Expat
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