code: @ObjectiveCName("unfavouriteChatCommandWithPeer:")
      public Command<Void> unfavoriteChat(Peer peer) {
          return callback -> modules.getMessagesModule().unfavoriteChat(peer)
                  .then(v -> callback.onResult(v))
                  .failure(e -> callback.onError(e));
      }
docs: Unfavouriting chat
  
  @param peer destination peer
  @return Command for execution