Added mumble update

lgsm/functions/command_update.sh

@@ -15,8 +15,10 @@ check.sh
 
 if [ "${gamename}" == "Teamspeak 3" ]; then
 	update_ts3.sh
+elif [ "${gamename}" == "Mumble" ]; then
+	update_mumble.sh
 else
 	update_steamcmd.sh
 fi
 
-core_exit.sh
+core_exit.sh