update readme.
update readme.

andybarry/flight,peteflorence/flight,andybarry/flight,andybarry/flight,andybarry/flight,peteflorence/flight,peteflorence/flight,andybarry/flight,peteflorence/flight,andybarry/flight,peteflorence/flight,peteflorence/flight,peteflorence/flight,andybarry/flight,andybarry/flight,andybarry/flight,andybarry/flight,peteflorence/flight,peteflorence/flight,peteflorence/flight