docs(readme.md): add new library to the list of Discord.py extensions

Add the `vcv88/discord-ext-dyn` library to the list of Discord.py
extensions. This library provides functionality for handling dynamic
modals, buttons, and select menus, enhancing the capabilities of
Discord.py projects. Including this library in the list helps users
discover more tools to extend their Discord.py applications.

Author: kzndotsh

readme.md

@@ -82,6 +82,7 @@ An Awesome list for all things Discord.py
 - [keizaiya/discord-ext-flow](https://github.com/keizaiya/discord-ext-flow) - This library extends discord.ui, providing UI control based on state flows.
 - [sizumita/discord-ext-ui](https://github.com/sizumita/discord-ext-ui) - An extension of discord-ui that adds some quality-of-life features.
 - [Seniatical/dpy-paginator](https://github.com/Seniatical/dpy-paginator) -  A simple pagination library for discord.py, comes with support for dropdown, button based pagination.
+- [vcv88/discord-ext-dyn](https://github.com/vcv88/discord-ext-dyn) - An extension for handling dynamic modals/buttons/select menus
 
 ### Inter-Process Communication