Update link to OpenSwoole website (#569)

* Link to official (Open)Swoole websites

* Revert to GitHub for Swoole

Author: spawnia

README.md

@@ -9,7 +9,7 @@
 
 ## Introduction
 
-Laravel Octane supercharges your application's performance by serving your application using high-powered application servers, including [Open Swoole](https://swoole.co.uk), [Swoole](https://github.com/swoole/swoole-src), and [RoadRunner](https://roadrunner.dev). Octane boots your application once, keeps it in memory, and then feeds it requests at supersonic speeds.
+Laravel Octane supercharges your application's performance by serving your application using high-powered application servers, including [Open Swoole](https://openswoole.com), [Swoole](https://github.com/swoole/swoole-src), and [RoadRunner](https://roadrunner.dev). Octane boots your application once, keeps it in memory, and then feeds it requests at supersonic speeds.
 
 ## Official Documentation