chore(package): update @types/sinon to version 9.0.3

Closes #64

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
         "@types/mocha": "^5.2.7",
         "@types/mz": "0.0.32",
         "@types/node": "^12.11.7",
-        "@types/sinon": "^7.5.0",
+        "@types/sinon": "^9.0.3",
         "@types/sinon-chai": "^3.2.3",
         "chai": "^4.2.0",
         "del": "^5.1.0",