Update demo app link in README.md

Author: damms005

README.md

@@ -60,7 +60,7 @@ php artisan migrate
 ```
 
 ### Demo Repo
-I published an open source app that uses this payment package. It is also an excellent example of a Laravel app that uses [Laravel Vite](https://laravel.com/docs/9.x/vite#main-content) and leverages on [Laravel Echo](https://laravel.com/docs/9.x/broadcasting#client-side-installation) to provide realtime experience via public and private channels using [Laravel Websocket](https://beyondco.de/docs/laravel-websockets), powered by [Livewire](https://laravel-livewire.com/docs). The app is called [NFT Marketplace. Click here to check it out ✌🏼](https://github.com/damms005/nft-marketplace-l9)
+I published an open source app that uses this payment package. It is also an excellent example of a Laravel app that uses [Laravel Vite](https://laravel.com/docs/9.x/vite#main-content) and leverages on [Laravel Echo](https://laravel.com/docs/9.x/broadcasting#client-side-installation) to provide realtime experience via public and private channels using [Laravel Websocket](https://beyondco.de/docs/laravel-websockets), powered by [Livewire](https://laravel-livewire.com/docs). The app is called [NFT Marketplace. Click here to check it out ✌🏼](https://github.com/damms005/nft-marketplace)
 
 ### Test drive 🚀