Update to 2.081

Upstream changes:
2.081 4 April 2018

      * previous release used $^W instead of use warnings. Fixed.

  2.080 2 April 2018

      * bin/zipdetails
        #124003: zipdetails SYNOPSIS section got a typo: zipdetaile-> zipdetails

      * IO::Uncompress::Base.pm
        Changes for Archive::Zip::SimpleUnzip

      * bin/zipdetails
        Fix issues with zip64 archives.

      * bin/zipdetails
        Cope with zip archives where there is padding data after the compressed payload.
        Example is Microsoft appx file.

      * File::GlobMapper
        #120580: File::GlobMapper::$VERSION needs increment; trailing whitespace

      * t/cz-03zlib-v1.t
        valgrind errors fixed in Compress::Raw::Zlib 2.0.75 for issue #121074
        #121076: uninitialized errors from valgrind

(wen)