Update the vendored version of tylerb/graceful

This was a mechanical change using the following commands: gvt delete github.com/tylerb/graceful gvt fetch -revision 4654dfbb6ad53cb5e27f37d99b02e16c1872fbbb \ https://github.com/tylerb/graceful This is needed to pick up the fix for tylerstillwater/graceful#85
vmware · Oct 25, 2017 · 9bad62d · 9bad62d
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diff --git a/vendor/github.com/tylerb/graceful/graceful.go b/vendor/github.com/tylerb/graceful/graceful.go