[xmlunit/xmlunit] 4ee937: document assertj workaround, closes #181

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

  Branch: refs/heads/master
  Home:   https://github.com/xmlunit/xmlunit
  Commit: 4ee93796b1a2741b40e6aa20cf5be047d15db208
      https://github.com/xmlunit/xmlunit/commit/4ee93796b1a2741b40e6aa20cf5be047d15db208
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2020-05-04 (Mon, 04 May 2020)

  Changed paths:
    M RELEASE_NOTES.md

  Log Message:
  -----------
  document assertj workaround, closes #181