[xmlunit/xmlunit.net] 415477: bump version for 2.9.1

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

  Branch: refs/heads/main
  Home:   https://github.com/xmlunit/xmlunit.net
  Commit: 4154770661d4a15f32237a157e6810f0fb495808
      https://github.com/xmlunit/xmlunit.net/commit/4154770661d4a15f32237a157e6810f0fb495808
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2020-10-30 (Fri, 30 Oct 2020)

  Changed paths:
    M RELEASE_NOTES.md
    M appveyor.yml
    M src/doc/monodoc/core/index.xml
    M src/shared/CommonAssemblyInfo.cs

  Log Message:
  -----------
  bump version for 2.9.1