Don't respond to messages unless they're in a text channel with "music"

in the name.

src/main/java/moe/nekojimi/chords/Main.java

@@ -93,6 +93,10 @@ public class Main extends ListenerAdapter
         String content = message.getContentRaw();
         Guild guild = event.getGuild();
 
+        // Ignore message if it's not in a music channel
+        if (!event.getChannel().getName().contains("music"))
+            return;
+
         // Ignore message if bot
         if (author.isBot())
             return;