Add forgotten ..versionadded

discord/file.py

@@ -62,6 +62,8 @@ class File:
         a string then the ``filename`` will default to the string given.
     description: Optional[:class:`str`]
         The description (alt text) for the file.
+
+        .. versionadded:: 2.0
     spoiler: :class:`bool`
         Whether the attachment is a spoiler.
     """