Update to December GeoIP2 database
​[My geoip-2017-12-06 branch](https://gitweb.torproject.org/karsten/tor.git/log/?h=geoip-2017-12-06) contains the updated `geoip` and `geoip6` files with IPv4 and IPv6 ranges and is supposed to be merged into maint-0.2.5 and all other relevant branches.
issue