chore(package): update sinon to version 8.0.1

Closes #33

Author: greenkeeper[bot]

package.json

@@ -86,7 +86,7 @@
         "publish-please": "^5.4.3",
         "remap-istanbul": "^0.13.0",
         "rimraf": "^2.6.3",
-        "sinon": "^7.3.1",
+        "sinon": "^8.0.1",
         "sinon-chai": "^3.3.0",
         "ts-loader": "^5.3.3",
         "ts-node": "^8.0.3",