[btcsuite/btcutil] 68e596: Update travis to test against golang 1.7 (#80)

[David Hill]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcutil
  Commit: 68e5965458062d031a6e333b35c778ce464fb73f
      
https://github.com/btcsuite/btcutil/commit/68e5965458062d031a6e333b35c778ce464fb73f
  Author: David Hill <dh...@mindcry.org>
  Date:   2016-08-17 (Wed, 17 Aug 2016)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Update travis to test against golang 1.7 (#80)