Remove 3.4.2 from python versions that CI will test
Remove 3.4.2 from python versions that CI will test

- Remove 3.4.2 as we would only like to test against ‘latest’ release
of each version to cover bugfixes. In this case, 3.4 has already entered
“security fixes only” mode, so 3.4.4 was the latest “bugfix” release.
- The 3.5 and 3.6 aliases will float and update whenever Travis CI
updates their build images.

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