add limiter to sdk

package.json

@@ -41,6 +41,7 @@
         "read": "~1.0.5",
         "form-data": "~0.2.0",
         "chai": "~1.5.0",
+        "limiter": "^1.1.0",
         "mocha": "1.8.2"
     },
     "scripts": {