def update!(opts={})
      response = Hubspot::Connection.post_json(LIST_PATH, params: { list_id: @id }, body: opts)
      self.send(:assign_properties, response)
      self
    end
def update!(opts={})
      response = Hubspot::Connection.post_json(LIST_PATH, params: { list_id: @id }, body: opts)
      self.send(:assign_properties, response)
      self
    end
{http://developers.hubspot.com/docs/methods/lists/update_list}