Minor readme update

Author: walbourn

README.md

@@ -116,7 +116,7 @@ For a full change history, see [CHANGELOG.md](https://github.com/microsoft/Direc
 
 ## Support
 
-For questions, consider using [Stack Overflow](https://stackoverflow.com/questions/tagged/directxtk) with the _directxtk_ tag, or the [DirectX Discord Server](https://discord.gg/directx) in the _dx12-developers_ channel.
+For questions, consider using [Stack Overflow](https://stackoverflow.com/questions/tagged/directxtk) with the _directxtk_ tag, or the [DirectX Discord Server](https://discord.gg/directx) in the _dx12-developers_ or _input-and-audio_ channels.
 
 For bug reports and feature requests, please use GitHub [issues](https://github.com/microsoft/DirectXTK12/issues) for this project.