Update README.md

Author: mpociot

README.md

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 Bring the power of WebSockets to your Laravel application. Drop-in Pusher replacement, SSL support, Laravel Echo support and a debug dashboard are just some of its features.
 
-> If you want to learn how to create reusable PHP packages yourself, take a look at my upcoming [PHP Package Development](https://phppackagedevelopment.com) video course.
+[![https://phppackagedevelopment.com](https://beyondco.de/courses/phppd.jpg)](https://phppackagedevelopment.com)
+
+If you want to learn how to create reusable PHP packages yourself, take a look at my upcoming [PHP Package Development](https://phppackagedevelopment.com) video course.
 
 ## Documentation