chore(package): update karma-sinon-chai to version 2.0.0

Closes #153

Author: greenkeeper[bot]

package.json

@@ -104,7 +104,7 @@
     "karma-mocha-reporter": "2.2.5",
     "karma-phantomjs-launcher": "1.0.4",
     "karma-sauce-launcher": "1.2.0",
-    "karma-sinon-chai": "1.3.3",
+    "karma-sinon-chai": "2.0.0",
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "2.0.5",
     "leakage": "0.3.0",