[PATCH V5] update: warn if cwd was deleted

[Yuya Nishihara]

On Tue, 4 Oct 2016 04:08:42 -0700, Stanislau Hlebik wrote:
> # HG changeset patch
> # User Stanislau Hlebik <stash at fb.com>
> # Date 1475579208 25200
> #      Tue Oct 04 04:06:48 2016 -0700
> # Node ID 9069c255f60c9d34e5f45d690cfa9316fdc71722
> # Parent  1779dde4c9ef97cb242f8d501655f236f66e5439
> update: warn if cwd was deleted

Looks good to me per comments on V3 and V4. Queued, thanks.