docs.rs failed to build geoip-0.0.3
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let geoip = GeoIP::open(&Path::new("/opt/geoip/GeoIPASNum.dat"),
                        GeoIP::Options::MemoryCache).unwrap();
let ip = from_str("91.203.184.192").unwrap();
let res = geoip.as_info_by_ip(ip).unwrap();
assert!(res.asn == 41064);
assert!(res.name.contains("Telefun"));
assert!(res.netmask == 22);