minor #1700 Travis no longer supports hhvm-nightly (hason)
minor #1700 Travis no longer supports hhvm-nightly (hason)

This PR was merged into the 1.x branch.

Discussion
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Travis no longer supports hhvm-nightly

See travis-ci/travis-ci#3788

Commits
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329d67c Travis no longer supports hhvm-nightly

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