See: https://core.telegram.org/bots/api#setwebhook

async def setWebhook(self,
                         url=None,
                         certificate=None,
                         max_connections=None,
                         allowed_updates=None):
        """ See: https://core.telegram.org/bots/api#setwebhook """
        p = _strip(locals(), more=['certificate'])

        if certificate:
            files = {'certificate': certificate}
            return await self._api_request('setWebhook', _rectify(p), files)
        else:
            return await self._api_request('setWebhook', _rectify(p))