Copyright for libio-string-perl source package in Xenial

This package was originally debianized by Matt Hope
 on Wed,  7 Nov 2001 16:38:11 +1100.

Original source has been downloaded from
   http://www.cpan.org/authors/id/GAAS/

Upstream author is
   Gisle Aas
   email: gisle@ActiveState.com
   website: http://gisle.aas.no/
   http://search.cpan.org/search?author=GAAS

Original copyright notice:
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Copyright 1998-2005 Gisle Aas.

This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

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Perl is distributed under the terms of either:

   a) the GNU General Public License as published by the Free Software
      Foundation; either version 1, or (at your option) any later
      version, or

   b) the "Artistic License" which comes with Perl.

On Debian GNU/Linux systems, the complete text of the GNU General
Public License can be found in `/usr/share/common-licenses/GPL-1' and
the Artistic Licence in `/usr/share/common-licenses/Artistic'.