chore(deps): update dependency typescript to ~3.6.0 (#741)

Author: Renovate Bot

handwritten/firestore/package.json

@@ -81,6 +81,6 @@
     "proxyquire": "^2.0.1",
     "source-map-support": "^0.5.6",
     "ts-node": "^8.0.0",
-    "typescript": "~3.5.0"
+    "typescript": "~3.6.0"
   }
 }