Changes for version 0.59

• Add the missing README to the distribution (CPANTS).
• Add a LICENSE file (CPANTS).
• Add a "=head1 LICENSE" section to the POD (CPANTS).
• Minimum version of perl in META.yml (CPANTS).
• Add "use warnings;" (CPANTS).
• Add t/cpan-changes.t and t/style-trailing-space.t .