message: complete proptypes
diff: @@ -303,6 +303,9 @@ Autocomplete.propTypes = {
  // method invoked with range and text content when completion is confirmed
  onConfirm: PropTypes.func.isRequired,
  + // method invoked when selected (if any) completion changes
  + onSelectionChange: PropTypes.func,
  +
  // The room in which we're autocompleting
  room: PropTypes.instanceOf(Room),
  };
  