Ubuntu 18.04 on Travis, try to return to non-docker CI builds #118
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This is just a proposal. I do like the solution offered by @mame in #116, but maybe we can switch back to Travis itself, having faster builds.
What do you think in general of this approach?
PS: I'm opening this as a draft PR, since I don't actually know if it's gonna solve the
ruby-head
problems. But since the distribution used currently is an EOL Ubuntu 14.04, I thought I might as well try. :)