[whatwg/streams] Meta: enable HTML checker (#650)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/650

-- Commit Summary --

  * Meta: enable HTML checker

-- File Changes --

    M .travis.yml (4)

-- Patch Links --

https://github.com/whatwg/streams/pull/650.patch
https://github.com/whatwg/streams/pull/650.diff

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