chore(package): update sinon to version 8.1.0

Closes #38

Author: greenkeeper[bot]

package.json

@@ -67,7 +67,7 @@
     "pg": "^7.12.1",
     "pg-hstore": "^2.3.3",
     "pgpass": "^1.0.2",
-    "sinon": "^7.3.2",
+    "sinon": "^8.1.0",
     "ts-node": "^8.3.0",
     "typescript": "^3.5.3"
   }