Updated Tutorial (markdown)

Tutorial.md

@@ -17,9 +17,7 @@ export class AppController {
 }
 ```
 
-**Important:** This decorator package is only accepting asynchronous function for now.
-
-So we should change things to use async.
+**Since version 2.1.0, all decorator can be used with sync function.**
 
 ```ts
 import { Controller, Get } from '@nestjs/common';