Version 0.8.0

• Upgrade ChromeDriver to version 85.0.4183.87
• Upgrade geckodriver to version 0.27.0
• Add a Client::waitForVisibility() method to wait for an element to appear
• Allow passing options to the browser manager from PantherTestCase::createPantherClient()
• Add a Client::ping() method to check if the WebDriver connection is still active
• Fix setting a new value to an input field when there is an existing value
• Improve the error message when the web server crashes
• Throw an explanative LogicException when driver is not started yet
• Prevent timeouts caused by the integrated web server
• Fix the value of cookie secure flags
• Throw an exception when getting history (unsupported feature)
• Add docs to use Panther with GitHub Actions
• Various bug fixes and documentation improvements