Copyright for php-tijsverkoyen-css-to-inline-styles source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: CssToInlineStyles class
Source: https://github.com/tijsverkoyen/CssToInlineStyles
Upstream-Contact: Tijs Verkoyen 

Files: *
Copyright: Tijs Verkoyen 
License: BSD-3-clause
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