code: async def attach_url(self, url: str, description: str = None) -> Attachment:
          
          return await self._attach(url=url, description=description)
docs: add an url as an attachment
  
          |methcoro|
  
          Args:
              url: url you want to add
              description: *optional* description for your attachment
  
          Returns:
              Attachment:
  
          Raises:
              ValueError: url must not be None
              APIException