Log Message:
Update to 1.20

Upstream changes:
**** 1.20 Mar 22, 2019

        Revise documentation examples to use AAAA instead of A records.

        TSIG MAC representation changed to Base64 (align with BIND).

        Update Parameters.pm to resync with IANA registry.

        Refactor resolver test scripts.

Fix rt.cpan.org #128081

        Recurse.pm fails to resolve domain “kickboxingireland.ie”

Fix rt.cpan.org #127307

        Provide a more informative exception report if application code
        has no "use Net::DNS::SEC" declaration but nevertheless attempts
        to invoke the DNSSEC sign or verify features.