chore(package): update mocha-sinon to version 2.1.2

Closes #23

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "husky": "0.14.1",
     "loopback": "3.8.0",
     "mocha": "3.4.2",
-    "mocha-sinon": "2.0.0",
+    "mocha-sinon": "2.1.2",
     "nyc": "11.0.3",
     "semantic-release": "6.3.6",
     "sinon": "2.3.6",