Adds some notes about the limitations of this plugin

src/main/java/net/knarcraft/minstrel/command/MinstrelCommand.java

@@ -36,6 +36,8 @@ public class MinstrelCommand implements CommandExecutor {
             case "volume":
                 return updateVolume(minstrelTrait, args.length > 1 ? args[1] : null, sender);
         }
+        //TODO: Add another argument for volume and pitch for whether to immediately change the volume by restarting the playlist
+        
         /* Sub-commands:
             AddSong category identifier duration (remember to run play again)
             RemoveSong index