Minor updates

Author: rbrundritt

README.md

@@ -60,6 +60,7 @@ See the [documentation](https://github.com/Azure-Samples/azure-maps-gridded-data
 - Use of web workers for large data sets.
 - Offloading calculations to WebGL.
 - Option for geospatially accurate grids.
+- Polygon mask to clip to.
 
 ## Related Projects
 

package.json

@@ -19,8 +19,7 @@
   "author": "Microsoft Corporation",
   "license": "MIT",
   "dependencies": {
-    "azure-maps-control": "^2.0.25",
-    "mapbox-gl": "^1.12.0"
+    "azure-maps-control": "^2.0.25"
   },
   "devDependencies": {
     "@types/lodash": "^4.14.136",