chore(package): update sinon to version 9.0.1

Closes #8

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "@types/sinon": "^7.0.5",
     "mocha": "6.0.0",
     "node-mocks-http": "^1.7.3",
-    "sinon": "^7.2.3",
+    "sinon": "^9.0.1",
     "ts-node": "^8.0.2",
     "tslint": "~5.12.1",
     "typescript": "3.3"