`travisjs badge` is broken @ node v6

[azu]

$ node -v
v6.0.0

$ travisjs badge
(node:20670) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.
[![Build Status](https://travis-ci.org/textlint/textlint.svg?branch=master)](https://travis-ci.org/textlint/textlint)

graceful-fs show warning message and break following use-case.

$ travisjs badge | pbcopy