chore(package): update sinon to version 4.1.0

Author: greenkeeper[bot]

package.json

@@ -18,6 +18,6 @@
     "browserify": "^14.4.0",
     "expect.js": "~0.3.1",
     "mocha": "~4.0.0",
-    "sinon": "4.0.2"
+    "sinon": "4.1.0"
   }
 }