Release Notes for 2.1.0

This patch explicitly adds php:~8.0.0 support along with php:^7.4.7.

phpunit/phpunit had to also be upgraded, so that it does not contain symbols
that clash with the php:8.0.0 parser BC breaks.

To do so, we had to disable infection/infection reporting for now, as the
mutation testing setup is not yet capable of working with phpunit/phpunit:^9.3.

In addition to that, we now actively replace composer/package-versions-deprecated,
which is constantly causing issues in installation, and which is fully replaced by
this specific package. If you run composer/composer:^2.0 and php:8.0.0, there is
no reason to use composer/package-versions-deprecated anyway.

Please note that the support for PHP is limited to php:^7.4.7 || php:~8.0.0: php:8.1.0
is NOT supported by this release, as the upstream ecosystem is just too unstable
and regularly breaks BC in multiple ways. Once php:8.1.0-rc2 is out (possibly next year),
work will be done to support that too.

2.1.0

• Total issues resolved: 0
• Total pull requests resolved: 1
• Total contributors: 1

enhancement

• 161: Add php:8.0.* support thanks to @Ocramius