Fix a missing option in Cygwin README

[Darren Tucker]

On Mon, May 30, 2016 at 6:30 PM, Corinna Vinschen <vinschen at redhat.com>
wrote:

> Hi guys,
>
> the Cygwin README file misses to explain an option to the ssh-host-config
> script.  Patch attached.
>

Applied, thanks.

-- 
Darren Tucker (dtucker at zip.com.au)
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    Good judgement comes with experience. Unfortunately, the experience
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