docs: def update(self, item_id, attributes, silent=False, hook=True):
          """
          Updates the item using the supplied attributes. If 'silent' is true, Podio will send
          no notifications to subscribed users and not post updates to the stream.
          
          Important: webhooks will still be called.
          """
          if not isinstance(attributes, dict):
              raise TypeError('Must be of type dict')
          attributes = json.dumps(attributes)
          return self.transport.PUT(body=attributes,
                                    type='application/json',
                                    url='/item/%d%s' % (item_id, self.get_options(silent=silent,
                                                                                  hook=hook)))