Add an i3bar flag: --verbose

Fix the issue #3220. (https://github.com/i3/i3/issues/3220)

src/main.c

@@ -949,8 +949,9 @@ int main(int argc, char *argv[]) {
     Barconfig *barconfig;
     TAILQ_FOREACH(barconfig, &barconfigs, configs) {
         char *command = NULL;
-        sasprintf(&command, "%s --bar_id=%s --socket=\"%s\"",
+        sasprintf(&command, "%s %s --bar_id=%s --socket=\"%s\"",
                   barconfig->i3bar_command ? barconfig->i3bar_command : "i3bar",
+                  barconfig->verbose ? "-V" : "",
                   barconfig->id, current_socketpath);
         LOG("Starting bar process: %s\n", command);
         start_application(command, true);