fix: update relay tutorial link

Author: Haroenv

README.md

@@ -965,7 +965,7 @@ A collection of awesome things regarding React ecosystem.
 * [Relay GitHub](https://github.com/facebook/relay)
 
 #### Relay Tutorials
-* [Relay Tutorial](https://facebook.github.io/relay/docs/tutorial.html)
+* [official Relay Getting Started](https://facebook.github.io/relay/docs/en/introduction-to-relay-modern.html)
 * [Relay for Visual Learners](http://sgwilym.github.io/relay-visual-learners/)
 * [Getting Started with Relay](https://auth0.com/blog/2015/10/06/getting-started-with-relay/)
 * [Relay and Routing](https://medium.com/@cpojer/relay-and-routing-36b5439bad9)