XMLUnit for Java 2.6.4 and XMLUnit.NET 2.7.2 Released

Both releases fix a common bug where the XPath reported for missing
nodes could be wrong in certain edge cases.

• the XPath values for comparisons resulting in CHILD_LOOKUP
  differences could be wrong when NodeFilters were present.
  XMLUnit.NET Issue
  #29

This is the only change in XMLUnit.NET. In XMLUnit for Java the
AssertJ module has also been improved and is supposed to be compatible
with AssertJ 3.13+ now.

The full list of changes for XMLUnit for Java:

• the dependencies on JAXB implementation and its transitive
  dependencies has been promoted from test scope to optional for Java
  9 and later
  Issue #162

• added containsAnyNodeHavingXPath, containsAllNodesHavingXPath
  and hasXPath assertions to xmlunit-assertj.

• added extractingAttribute method to xmlunit-assertj.

• removed some redundant instanceof checks.
  PR #171 by
  @PascalSchumacher.

• xmlunit-assertj should now work with AssertJ-Core 3.13.x
  Issue #166

• xmlunit-legacy will now use NewDifferenceEngine even when an
  ElementQualifier different from the built-in ones is used.