AC: Update README
AC: Update README

SpotlightUK/TrackerTracker,SpotlightUK/TrackerTracker,artsy/TrackerTracker,SpotlightUK/TrackerTracker,paperlesspost/TrackerTracker,fstehle/TrackerTracker,fstehle/TrackerTracker,paperlesspost/TrackerTracker,fstehle/TrackerTracker,paperlesspost/TrackerTracker