Update to May GeoIP2 database
My geoip-2018-05-01 branch contains the updated geoip
and geoip6
files with IPv4 and IPv6 ranges and is supposed to be merged into maint-0.2.9 and other branches that are still maintained.
(Note to self when I use this ticket as template for the next months: 0.3.1 is end of life on 1 July 2018.)