Add some commonly used message apps icons for dunst

Author: zeerayne

Configs/.config/dunst/dunst.conf

@@ -462,3 +462,15 @@
 [skype]
     desktop_entry = "^Skype$"
     new_icon = skype
+
+[discord]
+    desktop_entry = "^Discord$"
+    new_icon = discord
+
+[zapzap]
+    desktop_entry = "^ZapZap$"
+    new_icon = whatsapp
+
+[zapzap]
+    desktop_entry = "^Viber$"
+    new_icon = viber