[w3c/payment-handler] Add .travis.yml (#182)

Used for auto-publishing on merge
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/182

-- Commit Summary --

  * Used for auto-publishing on merge

-- File Changes --

    A .travis.yml (13)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/182.patch
https://github.com/w3c/payment-handler/pull/182.diff

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