Update to 0.28
    
    - New upstream release 0.28:
      - Fix test failures when run as root - they were relying on permissions
        failures, but permissions never fail as root
      - Add links in docs to the other modules we rely on and talk about in the
        docs, which makes for easier viewing through search.cpan.org / MetaCPAN
      - Fixed some misleading variable names in docs (CPAN RT#81795)