[xmlunit/xmlunit.net] d9d6ae: port fix for xmlunit/#156 to XMLUnit.Net

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

  Branch: refs/heads/master
  Home:   https://github.com/xmlunit/xmlunit.net
  Commit: d9d6ae3258c285a8d8e043ecb0786f8a27983e8b
      https://github.com/xmlunit/xmlunit.net/commit/d9d6ae3258c285a8d8e043ecb0786f8a27983e8b
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2019-06-15 (Sat, 15 Jun 2019)

  Changed paths:
    M RELEASE_NOTES.md
    M src/main/net-core/Diff/DOMDifferenceEngine.cs
    M src/tests/net-core/Diff/DOMDifferenceEngineTest.cs

  Log Message:
  -----------
  port fix for xmlunit/#156 to XMLUnit.Net