code: async def unban(self, channel, target, range=0):
          
          if target in self.users:
              host = self.users[target]['hostname']
          else:
              host = target
  
          host = self._format_host_range(host, range)
          mask = self._format_host_mask('*', '*', host)
          await self.rawmsg('MODE', channel, '-b', mask)
docs: Unban user from channel. Target can be either a user or a host.
          See ban documentation for the range parameter.