chore(package): update sinon to version 1.17.6

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -35,7 +35,7 @@
     "kittik-cursor": "5.0.0",
     "mocha": "3.0.2",
     "semantic-release": "4.3.5",
-    "sinon": "1.17.5"
+    "sinon": "1.17.6"
   },
   "config": {
     "commitizen": {