added voice - airhorn command

bot.js

@@ -255,6 +255,34 @@ client.on('message', message => {
             case 'yuri':
                 message.channel.send(imgurRequest('yuri', 5));
                 break;
+
+            // Voice commands
+            case 'join':
+                message.member.voiceChannel.join();
+                break;
+            case 'leave':
+                message.member.voiceChannel.leave();
+                break;
+            case 'quiethorn':
+                message.member.voiceChannel.join().then(connection => {
+                    const dispatcher = connection.playFile('voice/mlg-airhorn.mp3');
+                    dispatcher.on('end', () => {
+                        message.member.voiceChannel.leave();
+                    });
+                    
+                    dispatcher.setVolume(0.01);
+                });
+                break;
+            case 'airhorn':
+                message.member.voiceChannel.join().then(connection => {
+                    const dispatcher = connection.playFile('voice/mlg-airhorn.mp3');
+                    dispatcher.on('end', () => {
+                        message.member.voiceChannel.leave();
+                    });
+                    
+                    dispatcher.setVolume(0.25);
+                });
+                break;
         }
 
     }