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Travis CI: Xenial is now the default Ubuntu in Travis
https://blog.travis-ci.com/2019-04-15-xenial-default-build-environment Also: __sudo: required__ no longer is [Travis are now recommending removing the __sudo__ tag](https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration) because the sudo command is always available in Travis CI and there is no longer any way to turn it off.
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