[xmlunit/xmlunit] 51976d: let's try to use an explicit matrix with Linux dis...

[Stefan B. <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/xmlunit/xmlunit
  Commit: 51976d842748fb708f7a2494b87e7c66f0c1cc21
      https://github.com/xmlunit/xmlunit/commit/51976d842748fb708f7a2494b87e7c66f0c1cc21
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2019-06-16 (Sun, 16 Jun 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  let's try to use an explicit matrix with Linux distros set