version bump

package.json

@@ -10,7 +10,7 @@
                     },
   "lib"           : ".",
   "main"          : "./walk.js",
-  "version"       : "2.2.1",
+  "version"       : "2.3.0-alpha",
   "repository": {
     "url": "git://github.com/coolaj86/node-walk.git"
   },