code: def set_footer(self, **kwargs):
          
          self.footer = {
              'text': kwargs.get('text'),
              'icon_url': kwargs.get('icon_url'),
              'proxy_icon_url': kwargs.get('proxy_icon_url')
          }
docs: set footer information of embed
          :keyword text: footer text
          :keyword icon_url: url of footer icon (only supports http(s) and attachments)
          :keyword proxy_icon_url: a proxied url of footer icon