feat(NIP-28): replaceable kind 41 channel metadata events

src/db.rs

@@ -399,7 +399,7 @@ pub fn write_event(conn: &mut PooledConnection, e: &Event) -> Result<usize> {
     // if this event is replaceable update, hide every other replaceable
     // event with the same kind from the same author that was issued
     // earlier than this.
-    if e.kind == 0 || e.kind == 3 || (e.kind >= 10000 && e.kind < 20000) {
+    if e.kind == 0 || e.kind == 3 || e.kind == 41 || (e.kind >= 10000 && e.kind < 20000) {
         let update_count = tx.execute(
             "UPDATE event SET hidden=TRUE WHERE id!=? AND kind=? AND author=? AND created_at <= ? and hidden!=TRUE",
             params![ev_id, e.kind, hex::decode(&e.pubkey).ok(), e.created_at],

src/event.rs

@@ -101,7 +101,6 @@ impl From<EventCmd> for Result<Event> {
 }
 
 impl Event {
-
     #[cfg(test)]
     pub fn simple_event() -> Event {
         Event {