Log Message:
py-selenium: updated to 3.8.0

Selenium 3.8.0
* Firefox options can now be imported from selenium.webdriver as FirefoxOptions
* Headless mode can now be set in Chrome Options using `set_headless`
* Headless mode can now be set in Firefox Options using `set_headless`
* Add the WebKitGTK WebDriver and options class
* Browser options can now be passed to remote WebDriver via the `options` parameter
* Browser option parameters are now standardized across drivers as `options`. \ 
`firefox_options`,
  `chrome_options`, and `ie_options` are now deprecated
* Added missing W3C Error Codes
* Support has been removed for Python versions 2.6 and 3.3