update README with file formats

Author: patttterson

README.md

@@ -4,7 +4,7 @@ A simple plugin for [On-Together: Virtual Co-Working](https://store.steampowered
 ## Custom Songs
 You can add your own custom songs to the media controls by placing audio files in the `BepInEx/plugins/BetterMediaControls/music` directory.
 
-Currently, due to a Unity limitation, only `.wav` files are supported. Any other file formats will be ignored.
+Currently, `.wav`, `.ogg`, and `.mp3` files are supported. Any other file formats will be ignored.
 > [!NOTE]
 > Use https://vert.sh/ for quick and easy audio file conversion