[conformal/btcjson] 721421: Be more specific in TravisCI go vet version test.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcjson
  Commit: 7214218925f33b31e4aba04add7f989a61d9c40a
      
https://github.com/conformal/btcjson/commit/7214218925f33b31e4aba04add7f989a61d9c40a
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-12-11 (Thu, 11 Dec 2014)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Be more specific in TravisCI go vet version test.