minor README change to fix #25464 (#48970)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/25464
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48970
Reviewed By: walterddr
Differential Revision: D25396284
Pulled By: janeyx99
fbshipit-source-id: 8355c417b5c8b8865f208d7d8e8154048423afd9
