use addeventlistener for mapml event instead of .on() for leaflet event

Author: yhy0217

src/mapml/handlers/AnnounceMovement.js

@@ -5,7 +5,10 @@ export var AnnounceMovement = L.Handler.extend({
       layerremove: this.totalBounds
     });
 
-    this._map.on('map-moveend', this.announceBounds);
+    this._map.options.mapEl.addEventListener(
+      'map-moveend',
+      this.announceBounds
+    );
     this._map.dragging._draggable.addEventListener('dragstart', this.dragged);
     this._map.options.mapEl.addEventListener(
       'mapfocused',
@@ -18,7 +21,10 @@ export var AnnounceMovement = L.Handler.extend({
       layerremove: this.totalBounds
     });
 
-    this._map.off('map-moveend', this.announceBounds);
+    this._map.options.mapEl.removeEventListener(
+      'map-moveend',
+      this.announceBounds
+    );
     this._map.dragging._draggable.removeEventListener(
       'dragstart',
       this.dragged