docs: def set_image(self, **kwargs):
          """
          set image of embed
          :keyword url: source url of image (only supports http(s) and attachments)
          :keyword proxy_url: a proxied url of the image
          :keyword height: height of image
          :keyword width: width of image
          """
          self.image = {
              'url': kwargs.get('url'),
              'proxy_url': kwargs.get('proxy_url'),
              'height': kwargs.get('height'),
              'width': kwargs.get('width'),
          }