Update package.json: 3.2.1

Author: Yves Richard

package.json

@@ -2,7 +2,7 @@
   "author": "Mapbox",
   "name": "mapbox.js",
   "description": "Mapbox plugin for Leaflet",
-  "version": "3.2.0",
+  "version": "3.2.1",
   "homepage": "http://mapbox.com/",
   "repository": {
     "type": "git",