docs: public ResponseWrapper addChatRoomMember(long roomId, String... members)
              throws APIConnectionException, APIRequestException {
          Preconditions.checkArgument(roomId > 0, "room id is invalid");
          Preconditions.checkArgument(members != null && members.length > 0, "member should not be empty");
          JsonArray array = new JsonArray();
          for (String username : members) {
              array.add(new JsonPrimitive(username));
          }
          return _httpClient.sendPut(_baseUrl + mChatRoomPath + "/" + roomId + "/members", array.toString());
      }