[conformal/btcjson] 503670: For now, do not have travis build tip.

[John C. Vernaleo]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcjson
  Commit: 503670f7a576b10227b12fe5526c6f05924fcf3e
      
https://github.com/conformal/btcjson/commit/503670f7a576b10227b12fe5526c6f05924fcf3e
  Author: John C. Vernaleo <j...@conformal.com>
  Date:   2014-12-02 (Tue, 02 Dec 2014)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  For now, do not have travis build tip.

The location of go vet moved but the new version only works with tip
while the old one works with release.  So for now, not building tip.