Improvements:
* Improve GeoJSON data update 668
* Add support for WKT layer 679
* Add Gaode basemap 681
* Change SearchControl zoom trait to None 688
* Add example notebooks for KML and GPX file formats 691
* Update GeoData API documentation to add point_stype attribute 695
* Add a callback on found event for searching in GeoJSON layer 707
* Add custom tile server GIF to example notebook 724
* Add support for DivIcon 727
* Support for transparent WidgetControl 732
* Update LeafletJS from 1.3.0 to 1.7.1 734
* Add Map.fit_bounds(bounds) 737
* Add MagnifyingGlass layer 733
Fixes:
* Add Shapely as a dependency 683
* Add nodejs dependency to Binder environment 700
* Set --minimize=False on Binder 704
* Remove class_name 729
* Change license to MIT 736
* Fix WMS layer options 755