[whatwg/streams] Meta: update .travis.yml (#864)

To adapt to https://github.com/whatwg/whatwg.org/pull/119 and https://github.com/whatwg/whatwg.org/pull/137.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/864

-- Commit Summary --

  * Meta: update .travis.yml

-- File Changes --

    M .travis.yml (8)

-- Patch Links --

https://github.com/whatwg/streams/pull/864.patch
https://github.com/whatwg/streams/pull/864.diff

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https://github.com/whatwg/streams/pull/864