Copyright for php-twig source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Twig
Upstream-Contact: Fabien Potencier 
Source: https://github.com/twigphp/Twig

Files: *
Copyright: 2009-2020 Twig Team
           2019 Fabien Potencier
           Armin Ronacher
License: BSD-3-clause

Files: src/Extension/EscaperExtension.php
Copyright: 2009-2020 Twig Team
           Fabien Potencier
           2005-2012 Zend Technologies USA Inc.
License: BSD-3-clause and BSD-3-clause-Zend

Files: extra/html-extra/tests/Fixtures/data_uri.test
Copyright: 2004-2019 Fabien Potencier
License: BSD-3-clause and CC-BY-SA-3.0
Comment: Icon created by SensioLabs are shared under CC-BY-SA-3.0.

Files: debian/*
Copyright: 2014-2016 Debian PHP PEAR Maintainers
           2013-2014 Daniel Beyer
           2012, 2013 Paul Waring
           2012 Guillaume Duhamel
License: Expat

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