As described on Max Mind pages there is new version of GeoIP API (GeoIP2) which is not compatible with old one (as far as I know).
 Are You going to change code to support new GeoLite2 (City) format ?

 http://dev.maxmind.com/geoip/geoip2/geolite2/

 Regards

Probably not.  According to their site, GeoIP2 is not a "new version" of GeoIP; it's a paid web service they're offering in ADDITION to GeoIP.

So basically you can pay for the privilege of doing the exact same thing you're doing now, just more slowly because all of the lookups have to be submitted to their API server instead of being handled locally on your own server.  It doesn't seem like the best value proposition from my perspective, although I'm open to other opinions.

To clarify, I meant GeoLite2 database

Well this is totally new database.
You still have lite version of database to keep on server "http://dev.maxmind.com/geoip/geoip2/geolite2/"

I'm already using it in my own project. GeoLite (city/country) is marked as "Legacy".

But actually I can see that GeoLite is more up to date than GeoLite2 (wierd)