code: def history(self, channel_name, **kwargs):
          
          channel_id = self.get_channel_id(channel_name)
          self.params.update({'channel': channel_id})
          if kwargs:
              self.params.update(kwargs)
          return FromUrl('https://slack.com/api/channels.history', self._requests)(data=self.params).get()
docs: https://api.slack.com/methods/channels.history