[xmlunit/xmlunit] b9c555: change Travis CI links

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

  Branch: refs/heads/main
  Home:   https://github.com/xmlunit/xmlunit
  Commit: b9c55531a6ecdbbd4cce33186005f3a0a2465896
      https://github.com/xmlunit/xmlunit/commit/b9c55531a6ecdbbd4cce33186005f3a0a2465896
  Author: Stefan Bodewig <bo...@ap...>
  Date:   2022-12-05 (Mon, 05 Dec 2022)

  Changed paths:
    M README.md

  Log Message:
  -----------
  change Travis CI links