update polybar with title of window

polybar/config.ini

@@ -56,8 +56,8 @@ font-0 = Hack:style=Regular:size=11;1
 font-1 = unifont:style=Regular:size=11;0
 font-2 = siji:style=Regular:size=11;1
 
-modules-left = i3
-modules-center = date 
+modules-left = i3 title
+modules-center = date
 modules-right = cpu memory wlan pulseaudio battery
 
 tray-position = right
@@ -79,6 +79,11 @@ wm-restack = i3
 cursor-click = pointer
 cursor-scroll = ns-resize
 
+[module/title]
+type = internal/xwindow
+label-maxlen = 25
+
+
 [module/i3]
 type = internal/i3
 format = <label-state> <label-mode>