Add geoip2-rs Rust reader

Author: oschwald

content/geoip/docs/databases.md

@@ -101,6 +101,7 @@ integrator for assistance.
 | R                    | rgeolocate                      | [CRAN](https://cran.r-project.org/web/packages/rgeolocate/index.html)       | [README](https://github.com/Ironholds/rgeolocate/blob/master/README.md)            | [GitHub](https://github.com/Ironholds/rgeolocate)            |
 | Racket               | geoip                           |                                                                             | [Racket Documentation](https://docs.racket-lang.org/geoip/index.html)              | [GitHub](https://github.com/Bogdanp/racket-geoip)            |
 | Raku                 | GeoIP2                          |                                                                             | [README](https://github.com/bbkr/GeoIP2/blob/master/README.md)                     | [GitHub](https://github.com/bbkr/GeoIP2)                     |
+| Rust | geoip2 | [Cargo](https://crates.io/crates/geoip2) | [API docs](https://docs.rs/geoip2/0.1.6/geoip2/) | [GitHub](https://github.com/IncSW/geoip2-rs) | 
 | Rust                 | maxminddb                       | [Cargo](https://crates.io/crates/maxminddb)                                 | [API docs](https://oschwald.github.io/maxminddb-rust/maxminddb/struct.Reader.html) | [GitHub](https://github.com/oschwald/maxminddb-rust)         |
 | Scala                | maxmind-geoip2-scala            |                                                                             | [README](https://github.com/Sanoma-CDA/maxmind-geoip2-scala/blob/master/README.md) | [GitHub](https://github.com/Sanoma-CDA/maxmind-geoip2-scala) |
 | Swift (C extension)  | MaxMindDBSwift |  | [README](https://github.com/SunboyGo/MaxMindDBSwift/blob/main/README.md) | [GitHub](https://github.com/SunboyGo/MaxMindDBSwift) |