Bump version to 2.3.3

package.json

 {
   "name": "ltt-mapmaker",
-  "version": "2.0.0",
+  "version": "2.3.3",
   "description": "Visual Map Maker for Let Them Trade",
   "productName": "Let Them Trade Map-Maker",
   "author": "Griefed <griefed@griefed.de>",