relays: keep in sync with user relay list

Still need to figure out how to ensure new bootstrap relays are added...

Changelog-Changed: Ensure contact relay list is kept in sync with internal relay pool

damus/Util/Notifications.swift

@@ -13,6 +13,12 @@ extension Notification.Name {
     }
 }
 
+extension Notification.Name {
+    static var relays_changed: Notification.Name {
+        return Notification.Name("relays_changed")
+    }
+}
+
 extension Notification.Name {
     static var select_event: Notification.Name {
         return Notification.Name("select_event")