Build: Make Travis CI use `group: travis_latest`
Build: Make Travis CI use `group: travis_latest`

 " `group: travis_latest` - Feature Filled

   When your work requires recent and freshly updated packages,
   you can make use of `group: travis_latest`. We intend to
   update the fast path frequently and regularly (once a month)
   with the latest versions of a variety of packages. If you’re
   working with new feature sets as they roll out or simply want
   the latest and greatest, this is the path for you.

   ...

   If it’s not specified, we will automatically set your build
   image to `travis_lts`. "

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Ref: https://blog.travis-ci.com/2017-12-01-new-update-schedule-for-linux-build-images

sonarwhal/sonar,alrra/sonar,alrra/sonar,alrra/sonar,sonarwhal/sonar,sonarwhal/sonar