Update to March GeoIP2 database
​[My geoip-2019-03-04 branch](https://gitweb.torproject.org/user/karsten/tor.git/log/?h=geoip-2019-03-04) 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.
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