Copyright for php-dragonmantank-cron-expression source package in Oracular

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: PHP Cron Expression Parser
Upstream-Contact: Chris Tankersley 
Source: https://github.com/dragonmantank/cron-expression

Files: *
Copyright: 2011 Michael Dowling 
           2016 Chris Tankersley 
License: Expat

Files: debian/*
Copyright: 2020 Robin Gustafsson 
License: Expat

License: Expat
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 of this software and associated documentation files (the "Software"), to deal
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