Log Message:
Update to 0.28
Update LICENSE

Upstream changes:
0.26 (2018/06/09)
    Implemented refactoring due warnings from Perl::Critic.

0.25 (2018/06/04)
    Implemented refactoring due warnings from Perl::Critic.
    Merge pull request #3 from manwar/suggest-code-tidy

0.24 (2018/06/02)
    Added a LICENSE file (GNU GPL v3).
    Removed MYMETA files (see https://rt.cpan.org/Ticket/Display.html?id=108171).
    Improved Kwalitee by adding information to Makefile.PL
    Fixed tests under OpenBSD
    Added some code to check for OpenBSD tar, which is not quite compatible to \ 
the command line options passed by this module.
    Also made the method is_gnu() more robust, testing the return code and \ 
properly handling STDOUT and STDERR when trying "tar --version".
    Dependencies added are those already available on standard perl (Config and \ 
IPC::Open3).
    Added a README.md for better formatting in Github project page.
    Small refactorings and code formating with perltidy.