[w3c/FileAPI] Update to Python 3 (#148)

Closes [webappswg/issues/31](https://github.com/w3c/webappswg/issues/31)


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

  https://github.com/w3c/FileAPI/pull/148

-- Commit Summary --

  * Update to Python 3

-- File Changes --

    M .travis.yml (2)

-- Patch Links --

https://github.com/w3c/FileAPI/pull/148.patch
https://github.com/w3c/FileAPI/pull/148.diff

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https://github.com/w3c/FileAPI/pull/148