'Update a sponsor given its id'

@requires_auth
@replace_event_id
@can_update(DAO)
@api.doc('update_sponsor', responses=PUT_RESPONSES)
@api.marshal_with(SPONSOR)
@api.expect(SPONSOR_POST)
def put(self, event_id, sponsor_id):

    return DAO.update(event_id, sponsor_id, self.api.payload)
