Log Message:
p5-Geo-IP: update to 1.51.

1.51     2017-10-11

- Added the following missing methods for IPv6 lookups to the pure Perl
  implementation: name_by_addr_v6, name_by_name_v6, org_by_addr_v6, and
  org_by_name_v6. Reported by Earl Killian. GitHub #28.