Log Message:
Update to 0.66

Upstream changes:
0.66   2019-02-27
    - Fix tests on Windows (thanks to Serguei Trouchelle)

0.65   2019-02-19
    - Canonical repo is now https://github.com/DrHyde/perl-modules-Test-Differences
    - Fix discrepancies in copyright notices (thanks to Christian Neukirchen
      for pointing them out)
    - Make the tests more consistent (thanks to genio)
    - Add unicode tests
    - Fix whitespace issue in tests when using recent Test::More in verbose mode
      (thanks to ntnyi for debugging)
    - Get rid of Build.PL, just use Makefile.PL