chore(package): update sinon to version 9.0.1

Closes #293

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "react-dom": "^16.3.0",
     "react-router": "^3.0.4",
     "react-test-renderer": "^15.6.1",
-    "sinon": "2.3.8",
+    "sinon": "9.0.1",
     "webpack": "3.3.0",
     "webpack-dev-server": "2.6.1"
   },