Fixed mis-written get_timeline_selection() function

This fixes #36

ptsl/engine.py

@@ -936,12 +936,12 @@ def select_tracks_by_name(self, names: List[str],
  op = ops.SelectTracksByName(track_names=names, selection_mode=mode)
  self.client.run(op)
 
- def get_timeline_selection(self) -> Tuple[str, str]:
+ def get_timeline_selection(self, format: pt.TrackOffsetOptions = pt.TrackOffsetOptions.TimeCode) -> Tuple[str, str]:
  """
  Returns data about the current timeline selection.
  :returns: a Tuple of the In and Out time.
  """
- op = ops.GetMemoryLocations()
- response = self.client.run(op)
+ op = ops.GetTimelineSelection(time_scale=format)
+ self.client.run(op)
 
- return (response.in_time, response.out_time)
+ return (op.response.in_time, op.response.out_time)