Update to June GeoIP2 database
​[My geoip-2018-06-07 branch](https://gitweb.torproject.org/karsten/tor.git/log/?h=geoip-2018-06-07) 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 next month: 0.3.1 is end of life on 1 July 2018.)
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