Normalised key values don't match those in the webdriver spec.

[seanparsons]

The escape sequences here:
https://github.com/nbloomf/webdriver-w3c/blob/master/src/Web/Api/WebDriver/Types/Keyboard.hs#L58-L95
Don't match up with the escape sequences listed in the spec:
https://w3c.github.io/webdriver/webdriver-spec.html#keyboard-actions

[hughjfchen]

Any update for this? PR?