meridian command for switching from 12/24 format

src/main.rs

@@ -202,6 +202,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
         .add_command("blacklist", &moderation_cmds::BLACKLIST_COMMAND)
         .add_command("restrict", &moderation_cmds::RESTRICT_COMMAND)
         .add_command("timezone", &moderation_cmds::TIMEZONE_COMMAND)
+        .add_command("meridian", &moderation_cmds::CHANGE_MERIDIAN_COMMAND)
         .add_command("prefix", &moderation_cmds::PREFIX_COMMAND)
         .add_command("lang", &moderation_cmds::LANGUAGE_COMMAND)
         .add_command("pause", &reminder_cmds::PAUSE_COMMAND)