add modify conversation api

internal/rpc/msg/send_msg.go

@@ -254,6 +254,7 @@ func (rpc *rpcChat) SendMsg(_ context.Context, pb *pbChat.SendMsgReq) (*pbChat.S
 		case constant.MemberQuitNotification:
 			addUidList = append(addUidList, pb.MsgData.SendID)
 		case constant.AtText:
+			go func() {
 				var conversationReq pbConversation.ModifyConversationFieldReq
 				var tag bool
 				var atUserID []string
@@ -301,7 +302,7 @@ func (rpc *rpcChat) SendMsg(_ context.Context, pb *pbChat.SendMsgReq) (*pbChat.S
 						log.NewError(conversationReq.OperationID, "ModifyConversationField rpc failed, ", conversationReq.String(), conversationReply.String())
 					}
 				}
-
+			}()
 		default:
 		}
 		groupID := pb.MsgData.GroupID