+volume module to i3bar

i3status.conf

@@ -9,6 +9,7 @@ general {
 order += "wireless wlp2s0"
 order += "ethernet enp1s0"
 order += "disk /home"
+order += "volume master"
 order += "battery 0"
 order += "tztime local"
 
@@ -40,3 +41,7 @@ battery 0 {
         path = "/sys/class/power_supply/BAT%d/uevent"
         low_threshold = 10
 }
+
+volume master {
+       format = " %volume"
+}