v1.3.0

• Feature: Support Symfony 6 and PHP 8.1 release.
  (#122 and #123 by @clue)

• Feature: Bundle StubGenerator and Extract from legacy herrera-io/box v1.6.1.
  (#119 by @clue)

• Feature / Fix: Fix check for valid package URL.
  (#117 by @icedream)

• Update project setup, use PSR-4 autoloading, drop composer.lock and instead lock PHP version when building phar.
  (#120 and #124 by @clue and #118 by @PaulRotmann)

• Improve test suite and add .gitattributes to exclude dev files from exports.
  Update test suite to support PHPUnit 9 and test against PHP 8.1 release.
  (#121 and #125 by @clue)