[issue36307] Upgrade Travis CI config to Xenial from near-EoL Trusty and remove obsolete sudo: false key

[C.A.M. Gerlach]

C.A.M. Gerlach <CAM.Gerlach at Gerlach.CAM> added the comment:

Sure, thing, sorry—I realized I should have added one but apparently couldn't edit my post to include it.

[Here's](https://docs.travis-ci.com/user/reference/overview/#deprecated-virtualization-environments) a description of the removal of the obsolete sudo: false key in the Travis docs, and [here's](https://blog.ubuntu.com/2019/02/05/ubuntu-14-04-trusty-tahr) a blog post on the imminent EoL of [Trusty Tar](https://blog.ubuntu.com/2019/02/05/ubuntu-14-04-trusty-tahr).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36307>
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