Add missing ssh-host-config --name option

Patch from vinschen@redhat.com.
diff --git a/contrib/cygwin/README b/contrib/cygwin/README
index 1396d99..a73a0f6 100644
--- a/contrib/cygwin/README
+++ b/contrib/cygwin/README
@@ -25,6 +25,7 @@
     --yes    -y            Answer all questions with "yes" automatically.
     --no     -n            Answer all questions with "no" automatically.
     --cygwin -c <options>  Use "options" as value for CYGWIN environment var.
+    --name   -N <name>     sshd windows service name.
     --port   -p <n>        sshd listens on port n.
     --user   -u <account>  privileged user for service, default 'cyg_server'.
     --pwd    -w <passwd>   Use "pwd" as password for privileged user.