[whatwg/streams] update travis config (#595)

'stable' isn't supposed to be used anymore as a version alias, in the post-1.0 world. And optionally, should node 6.x keep being tested against as a baseline rather than exclusively testing the latest version?
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/595

-- Commit Summary --

  * travis: use 'node' version alias
  * travis: keep testing against nodejs v6.x

-- File Changes --

    M .travis.yml (4)

-- Patch Links --

https://github.com/whatwg/streams/pull/595.patch
https://github.com/whatwg/streams/pull/595.diff

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