Modernise and update README

Signed-off-by: AutomatedTester <dburns@mozilla.com>
Update the location of the latest editor's draft
remove duplicate definition so that respec doesn't complain more.
Andreas Tolfsen Add link to https://w3c.github.io/webdriver/ and bug tracker

Signed-off-by: AutomatedTester <dburns@mozilla.com>