[conformal/btcutil] a36fbe: Correct DefaultWalletLayout example link.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcutil
  Commit: a36fbe9ade7ec311cf2e1d3a3871e1e7507ba7e1
      
https://github.com/conformal/btcutil/commit/a36fbe9ade7ec311cf2e1d3a3871e1e7507ba7e1
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-07-22 (Tue, 22 Jul 2014)

  Changed paths:
    M hdkeychain/README.md

  Log Message:
  -----------
  Correct DefaultWalletLayout example link.