chore(package): update @types/sinon to version 9.0.1

Closes #41

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "@types/lodash": "^4.14.138",
     "@types/lolex": "^3.1.1",
     "@types/mocha": "^5.2.7",
-    "@types/sinon": "^7.0.13",
+    "@types/sinon": "^9.0.1",
     "@types/sinon-chai": "^3.2.3",
     "chai": "^4.2.0",
     "concurrently": "^4.1.2",