• Add Client::waitForEnabled(), Client::waitForDisabled(), Client::waitForAttributeToContain() and Client::waitForAttributeToNotContain() methods
• Add PantherTestCase::assertSelectorAttributeContains(), PantherTestCase::assertSelectorAttributeNotContains(), PantherTestCase::assertSelectorWillExist(),
  PantherTestCase::assertSelectorWillNotExist(), PantherTestCase::assertSelectorWillBeVisible(), PantherTestCase::assertSelectorWillNotBeVisible(),
  PantherTestCase::assertSelectorWillContain(), PantherTestCase::assertSelectorWillNotContain(), PantherTestCase::assertSelectorWillBeEnabled(),
  PantherTestCase::assertSelectorWillBeDisabled, PantherTestCase::assertSelectorAttributeWillContain(), and PantherTestCase::assertSelectorAttributeWillNotContain()
  assertions
• Automatically take a screenshot when a test fail and if the PANTHER_ERROR_SCREENSHOT_DIR environment variable is set
• Add missing return types
• Breaking Change: Remove the deprecated PHPUnit listener, use the PHPUnit extension instead
• Breaking Change: Remove deprecated support for Goutte, use HttpBrowser instead
• Breaking Change: Remove deprecated support for PANTHER_CHROME_DRIVER_BINARY and PANTHER_GECKO_DRIVER_BINARY environment variables, add the binaries in your PATH instead
• Don't allow unserializing classes with a destructor