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

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> Ah, miss-islington is still broken...

Right: https://github.com/python/miss-islington/issues/219

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<https://bugs.python.org/issue36307>
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