more cleanup and update readme

src/main/java/com/jagrosh/jmusicbot/JMusicBot.java

@@ -87,7 +87,7 @@ public class JMusicBot
                                 new String[]{"High-quality music playback", "FairQueue™ Technology", "Easy to host yourself"},
                                 RECOMMENDED_PERMS);
         aboutCommand.setIsAuthor(false);
-        aboutCommand.setReplacementCharacter("\uD83C\uDFB6");
+        aboutCommand.setReplacementCharacter("\uD83C\uDFB6"); // 🎶
         
         // set up the command client
         CommandClientBuilder cb = new CommandClientBuilder()

src/main/java/com/jagrosh/jmusicbot/utils/FormatUtil.java

@@ -92,6 +92,6 @@ public class FormatUtil {
     
     public static String filter(String input)
     {
-        return input.replace("@everyone", "@\u0435veryone").replace("@here", "@h\u0435re").trim();
+        return input.replace("@everyone", "@\u0435veryone").replace("@here", "@h\u0435re").trim(); // cyrillic letter e
     }
 }