The code found here:

https://github.com/php-coveralls/php-coveralls#phpunit

<?xml version="1.0" encoding="UTF-8"?>
<phpunit ...>
    <logging>
        ...
        <log type="coverage-clover" target="build/logs/clover.xml"/>
        ...
    </logging>
</phpunit>

The above code is out of date!

PHPunit says the following:

Using <logging><log type="coverage-clover" target="build/logs/clover.xml"/></logging> to configure the Clover XML code coverage report is now deprecated, please use <coverage><report><clover outputFile="build/logs/clover.xml"/></report></coverage> instead.

Please update the readme.

Link:
https://github.com/sebastianbergmann/phpunit/blob/9.3.0/ChangeLog-9.3.md#configuration-of-code-coverage-and-logging-in-phpunitxml