add
use Milla
Use Archive::Tar's own compression mechanism.

This avoids the necesity for PerlIO::gzip, which is not core
and doesn't have a good test history on some platforms (Win32
especially).

Instead, we just let Archive::Tar handle the compression for us,
but to do that, we need to make sure the user has IO::Zlib installed.
up prereqs
0.03