[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:

Ah yes, I actually saw that before opening this issue; not sure why I completely forgot about it. Sorry about that and thanks for the reminder.

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