XMLUnit for Java 2.8.1

The only real change when compared to XMLUnit for Java 2.8.0 is the introduction of a new xmlunit-assertj3 module that requires AssertJ 3.18.1 or later in order to address a problem with running AssertJ tests in an OSGi environment.

The original xmlunit-assertj module will still be supported.

The full changelog of XMLUnit for Java 2.8.1

• added a new xmlunit-assertj3 module that requires AssertJ 3.18.1 or later.

This module no longer uses AssertJ internal classes that are not exported to OSGi environments and thus fixes issue #203.

The module (like AssertJ 3.x itself) requires Java 8 at runtime and is similar to xmlunit-assertj but is no drop-in replacement. It uses a different Java package from xmlunit-assertj and CompareAssert will no longer throw a JUnit 4.x ComparisonException but an opentest4j AssertionFailedError instead.

The existing xmlunit-assertj module will still be supported in future releases but expect AssertJ 3.x specific changes to only get applied to xmlunit-assertj3.

Many thanks to @Zegveld, @scordio and @joel-costigliola.