v0.3.0

What's Changed

• [#10] Update PhpStan to version 1 and level 9 by @kpicaza in #11
• [#12] Run CI both PHP 7.4 and 8.0 by @kpicaza in #13
• [#16] small cleanups by @kpicaza in #14
• [#8] Add support for PHP 8.1 by @kpicaza in #15
• [#8] Bump deps to pheature-flags 0.3.0 by @kpicaza in #16

Full Changelog: 0.2.0...0.3.0