update mailmap (with apologies to Olivier)
v0.2302

        * Drop minimum Perl version back to 5.6 (erroneously bumped by dzil)
        * Do not inherit from Exporter (requires Exporter 5.57) (thanks to
          Olivier Mengué)
        * 'use base ...' => 'use parent ...' as parent is lighter (thanks to
          Olivier Mengué)
bump Changes