added licenses to package.json

lib/package.json

@@ -10,5 +10,15 @@
                     },
   "lib"           : ".",
   "main"          : "./walk.js",
-  "version"       : "2.1.1"
+  "version"       : "2.1.1",
+  "licenses": [
+    {
+      "type": "MIT",
+      "url": "http://www.opensource.org/licenses/mit-license.php"
+    },
+    {
+      "type": "Apache2",
+      "url": "http://opensource.org/licenses/apache2.0.php"
+    }
+  ]
 }