- Fixes an issue where attempting to drop a marker on top of a ground overlay would just select the ground overlay without doing anything.
1.4.0
- Can now enable dropping markers on a map using [`enable_marker_dropping()`](https://github.com/gmplot/gmplot/wiki/GoogleMapPlotter.enable_marker_dropping). - [Markers](https://github.com/gmplot/gmplot/wiki/GoogleMapPlotter.marker) can now be dragged if their `draggable` parameter is set.