Fix 'reviewers' REST endpoint

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Fix "use open ':locale'" on Windows

There's a bug in Perl affecting it on Windows and I have to circumvent
it.

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
v0.008

  [Fixes]
  - Fix 'git gerrit reviewers'. It wasn't adding reviewers correctly.

  - Avoid the use of ':locale' IO layer on Windows, because it's not
    well supported there.