[btcsuite/btcrpcclient] e15ac5: travis: test against latest releases.

[David Hill]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcrpcclient
  Commit: e15ac5024a9aaaa03e1c896ed49eca31fba1082d
      
https://github.com/btcsuite/btcrpcclient/commit/e15ac5024a9aaaa03e1c896ed49eca31fba1082d
  Author: David Hill <dh...@mindcry.org>
  Date:   2017-01-15 (Sun, 15 Jan 2017)

  Changed paths:
    M .travis.yml
    M goclean.sh

  Log Message:
  -----------
  travis: test against latest releases.

While here, clean up goclean.sh.