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PHPUnit 9.3 released a new schema for the phpunit.xml configuration file. I had to migrate the file to the new format in order to avoid the warning. PHPUnit Versions older than 9.3 have to use the phpunit.xml.legacy configuration file, because the new format is unknown for them.
For further details concerning this pull request look into graphp/graphviz #46.
This pull request builds on top of reactphp/dns #163.
clue approved these changes Aug 19, 2020
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@SimonFrings Thanks for the update, changes LGTM! 
jsor approved these changes Aug 24, 2020
Merged