[w3c/IndexedDB] Update CI config to use Python 3.7 (#323)

Ref: https://github.com/tabatkins/bikeshed/commit/c6b80b5c2c707af24b58a56ef82d3a11faccb01f

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

  https://github.com/w3c/IndexedDB/pull/323

-- Commit Summary --

  * Update CI config to use Python 3.7

-- File Changes --

    M .travis.yml (2)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/323.patch
https://github.com/w3c/IndexedDB/pull/323.diff

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