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.
UnifiedSplitRaw
