Correct mispelled travellled
Correct mispelled travellled

Closes #40

peterbarker/dronekit-la,peterbarker/dronekit-la,dronekit/dronekit-la,peterbarker/dronekit-la,dronekit/dronekit-la,dronekit/dronekit-la,dronekit/dronekit-la,peterbarker/dronekit-la