Update build environment

[barambani]

How about we remove jdk8 from the build ?

[sirocchj]

Is there a reason why not worth adding instead of replacing?

[barambani]

Well, let's say that the reason is Travis. It looks like there is a bit of a mess around the Jdk versions supported by bionic. What I mean is this and this travis-ci/docs-travis-ci-com#2444 .
We are not in a rush on this change so we can wait, and if they decide that they will not support openjdk8 we might think again if we want to add a customization for that to the build. Or we might even consider migrating to Circle CI.

[codecov-io]

Codecov Report

Merging #170 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #170   +/-   ##
=======================================
  Coverage   59.79%   59.79%           
=======================================
  Files          38       38           
  Lines        1291     1291           
  Branches        6        6           
=======================================
  Hits          772      772           
  Misses        519      519

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[barambani]

I would close this, I have the feeling that is not gonna get merged soon. We will track other options in other prs. What do you think ?