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

Closes #38

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
         "@types/bluebird": "^3.5.26",
         "@types/chai": "^4.1.7",
         "@types/mocha": "^5.2.6",
-        "@types/sinon": "^7.0.11",
+        "@types/sinon": "^9.0.3",
         "bluebird": "^3.5.4",
         "browserify-versionify": "^1.0.6",
         "chai": "^4.2.0",