Since this repository was not recognized by Travis before 2015-01-01,
there is no need to include `sudo: false` as that is now the default.
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From https://docs.travis-ci.com/user/workers/container-based-infrastructure/#Routing-your-build-to-container-based-infrastructure:
" The default behavior, when no sudo usage is detected in
any customizable build phases, depends on the date when
the repository is first recognized by Travis CI:
* For repos we recognize before 2015-01-01, linux builds
are sent to our standard infrastructure.
* For repos we recognize on or after 2015-01-01, linux
builds are sent to our container-based infrastructure "
