chore(package): update sinon-chai to version 2.14.0

Closes #27

Author: greenkeeper[bot]

package.json

@@ -77,7 +77,7 @@
     "mocha": "^3.2.0",
     "selenium-webdriver": "3.3.0",
     "sinon": "2.1.0",
-    "sinon-chai": "2.9.0",
+    "sinon-chai": "2.14.0",
     "source-map-support": "0.4.14",
     "stream-browserify": "^2.0.1"
   }