[1.x] Adds links to Swoole / Open Swoole documentation (#441)

* [1.x] Adds links to Swoole / Open Swoole documentation

* Update README.md

Co-authored-by: Taylor Otwell <[email protected]>

Author: nunomaduro

README.md

@@ -9,7 +9,7 @@
 
 ## Introduction
 
-Laravel Octane supercharges your application's performance by serving your application using high-powered application servers, including [Swoole](https://swoole.co.uk) 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://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.
 
 ## Official Documentation