[xmlunit/xmlunit] 802312: prepare 2.2.0 release

[GitHub <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/xmlunit/xmlunit
  Commit: 8023121b1f64bbf286363181504ff85fa54bedd6
      https://github.com/xmlunit/xmlunit/commit/8023121b1f64bbf286363181504ff85fa54bedd6
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2016-06-04 (Sat, 04 Jun 2016)

  Changed paths:
    M RELEASE_NOTES.md
    M pom.xml
    M xmlunit-core/pom.xml
    M xmlunit-legacy/pom.xml
    M xmlunit-matchers/pom.xml

  Log Message:
  -----------
  prepare 2.2.0 release