Merge pull request #160 from francharbo/upgrade-esri-leaflet-cluster

upgrade package.json

Author: gavinr

package-lock.json

@@ -16,7 +16,7 @@
     "leaflet-shape-markers": "1.x"
   },
   "optionalDependencies": {
-    "esri-leaflet-cluster": "^2.0.0"
+    "esri-leaflet-cluster": "^2.1.0"
   },
   "devDependencies": {
     "@rollup/plugin-json": "^4.0.3",