chore(package): update sinon to version 9.0.1

Closes #27

Author: greenkeeper[bot]

package.json

@@ -79,7 +79,7 @@
     "react-dom": "^16.9.0",
     "react-test-renderer": "^16.12.0",
     "rimraf": "^3.0.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.1",
     "style-loader": "^1.0.0",
     "ts-jest": "^24.2.0",
     "ts-loader": "^6.0.4",