chore(package): update sinon-chai to version 2.11.0

Closes #42

Author: greenkeeper[bot]

package.json

@@ -90,7 +90,7 @@
     "rollup-watch": "2.5.0",
     "semver": "5.3.0",
     "sinon": "1.17.6",
-    "sinon-chai": "2.8.0",
+    "sinon-chai": "2.11.0",
     "webpack": "1.13.3"
   }
 }