[w3c/manifest] Revert to only processing on gh-pages (#547)

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

  https://github.com/w3c/manifest/pull/547

-- Commit Summary --

  * Update .travis.yml

-- File Changes --

    M .travis.yml (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/547.patch
https://github.com/w3c/manifest/pull/547.diff

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