Request Ubuntu Trusty on Travis CI
Request Ubuntu Trusty on Travis CI

Ubuntu Xenial will become the default soon:
https://blog.travis-ci.com/2019-04-15-xenial-default-build-environment

We aren't prepared, so for now, let's explicitly request the version we
know works.

newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat