Workaround for phpunit phpt bug

sebastianbergmann/phpunit#4971

CommandLine: ensure string functions receive strings (avoid warnings …

…on PHP 8.1)

Remove package.xml, which is not maintained anymore

Exclude "tests" directory from composer classmap

The test is not needed in the classmap, and it raised a warning
with composer v1.10 when autoloader optimization is enabled.

Resolves: #10

tag 1.2.2

tag 1.2.1

Release 1.2.0