code: @ObjectiveCName("sendMessageWithPeer:withText:withMentions:")
      public void sendMessage(@NotNull Peer peer, @NotNull String text, @Nullable ArrayList<Integer> mentions) {
          sendMessage(peer, text, null, mentions, false);
      }
docs: Send Text Message with mentions
  
  @param peer     destination peer
  @param text     message text
  @param mentions user's mentions