[examples] use queue.append instead of queue.put

examples/music.py

@@ -41,7 +41,7 @@ class MusicPlugin(Plugin):
     @Plugin.command('play', '<url:str>')
     def on_play(self, event, url):
         item = YoutubeDLInput(url).pipe(BufferedOpusEncoderPlayable)
-        self.get_player(event.guild.id).queue.put(item)
+        self.get_player(event.guild.id).queue.append(item)
 
     @Plugin.command('pause')
     def on_pause(self, event):