[i3] Update volume icon in i3status

i3/.config/i3status/i3status.conf

@@ -17,7 +17,7 @@ order += "ethernet _first_"
 order += "tztime local"
 
 volume master {
-    format = "%volume  "
+    format = "♪ %volume "
     format_muted = " "
     device = "default"
     mixer = "Master"