[whatwg/fetch] Meta: update .travis.yml (#648)

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

  https://github.com/whatwg/fetch/pull/648

-- Commit Summary --

  * Meta: update .travis.yml

-- File Changes --

    M .travis.yml (4)

-- Patch Links --

https://github.com/whatwg/fetch/pull/648.patch
https://github.com/whatwg/fetch/pull/648.diff

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