Update podlators to CPAN version 4.13

Update podlators to CPAN version 4.13

  [DELTA]

podlators 4.13 (2019-12-25)

    Drop support for Perl 5.6.  The minimum supported version is now Perl
    5.8.  Perl 5.6 had not been tested even by CPAN Testers in some time
    and isn't supported by Travis-CI, so true support is dubious.
    Dropping that version allows cleaning up some old compatibility code.

    Fix a warning when outputing to something without a PerlIO layer, such
    as when output_string is used.

    [Pod::Text] Fix behavior of S<> with Unicode input to be consistent
    with behavior with a default encoding, namely treat all whitespace
    inside S<> as non-space characters and do not collapse it with
    adjacent whitespace.

    [Pod::Text::Termcap] Remove an ancient workaround that set the
    TERMPATH environment variable whenever a Pod::Text::Termcap object was
    created in order to add /usr/share/lib/termcap, necessary on some
    ancient Solaris systems.  Setting environment variables is bad
    behavior for a module, and the Solaris systems requiring this
    workaround are long obsolete.

    [Pod::Text::Termcap] Remove the fallback to VT100 escape sequences if
    Term::Cap was not able to find sequences for bold, underline, or
    normal text, and instead skip that part of the formatting.  This will
    produce more correct behavior on dumb terminals at the possible cost
    of losing formatting on systems with malfunctioning terminal
    databases, which seems like an improvement.  Thanks, Zenin.  (#131124)

    Further improve the man/no-encode.t test to not care whether Encode
    was already loaded or not.  Thanks, Martin Becker.

    Improve logic for showing large test failures to avoid spurious
    failures on systems without diff.