included sinon.

package.json

@@ -16,6 +16,7 @@
     "redux-saga": "0.14.3",
     "request-promise": "4.2.0",
     "reselect": "2.5.4",
+    "sinon": "2.1.0",
     "style-loader": "0.13.2",
     "stylus-loader": "3.0.1",
     "stylus-normalize": "3.0.3"