Updated CHANGLOG

Updated CHANGELOG

CS fix

Bumped changelog

Updated changelog

Add alpha 2 note

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Fix for Symfony Console 5.1 (phpbench#639)

* Fix command return values

Ensure that int is returned by all commands

* Updates PHPStan (allow SF 5.1 dep)

* CS fixes

Fix phpunit deprecations (phpbench#619)

* Removed expect exception message annotations

* Migrate expectedException annotations

* Fix deprecated PHPUnit methods

* Enable fail on warnings in phpunit

* CS fixes

* Open file for read/write (fix issue with PHP 7.4)

We echo the written output to STDOUT - but previously we
did not open it for reading, whereas in PHP < 7.4 it didn't
seem to matter ...

* Do not allow failures with 7.4

* Handle edge case where min is 0 (avoid div by zero)

Updated CHANGELOG