[btcsuite/btcd] 4a5223: docs: Add chainhash to README.md (#739)

[Janus Troelsen]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 4a5223266c8f50f14dd5db53a195516d2e9f52eb
      
https://github.com/btcsuite/btcd/commit/4a5223266c8f50f14dd5db53a195516d2e9f52eb
  Author: Janus Troelsen <ysang...@gmail.com>
  Date:   2016-08-17 (Wed, 17 Aug 2016)

  Changed paths:
    M docs/README.md

  Log Message:
  -----------
  docs: Add chainhash to README.md (#739)