code: def change_display_name(self, first_name, last_name):
          
          log.info("[+] Changing the display name to '{} {}'".format(first_name, last_name))
          return self._send_xmpp_element(account.ChangeNameRequest(first_name, last_name))
docs: Changes the display name
  
          :param first_name: The first name
          :param last_name: The last name