Merge pull request #644 from ReactiveDB/renovate/typescript-4.x

chore(deps): update dependency typescript to v4

Author: Brooooooklyn

example/package.json

@@ -27,6 +27,6 @@
     "react-dom": "^15.4.2"
   },
   "devDependencies": {
-    "typescript": "^2.2.1"
+    "typescript": "^4.0.0"
   }
 }