chore(package): update sinon-chai to version 2.10.0

Closes #64

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -83,7 +83,7 @@
     "rollup": "0.38.1",
     "rollup-plugin-babel": "2.7.1",
     "sinon": "1.17.7",
-    "sinon-chai": "2.8.0",
+    "sinon-chai": "2.10.0",
     "webpack": "1.14.0"
   }
 }