2.0.0-beta.2

2.0.0-beta.2

• BREAKING CHANGE: Replaced IsZero() methods with HasData() methods on all
  result structs (including Names). The new methods provide clearer semantics:
  HasData() returns true when GeoIP data is found and false when no data is
  available. Unlike IsZero(), HasData() excludes Network and IPAddress fields
  from validation, allowing users to access network topology information even when
  no GeoIP data is found. The Network and IPAddress fields are now always
  populated for all lookups, regardless of whether GeoIP data is available.
• BREAKING CHANGE: Replaced all anonymous nested structs with named types to
  improve struct initialization ergonomics. All result structs (Enterprise, City,
  Country) now use named types like EnterpriseCityRecord, CityTraits,
  CountryRecord, etc. This makes it much easier to initialize structs in user
  code while maintaining the same JSON serialization behavior.
• BREAKING CHANGE: Changed Location.Latitude and Location.Longitude from
  float64 to *float64 to properly distinguish between missing coordinates and
  the valid location (0, 0). Missing coordinates are now represented as nil
  and are omitted from JSON output, while valid zero coordinates are preserved.
  This fixes the ambiguity where (0, 0) was incorrectly treated as "no data".
  Added Location.HasCoordinates() method for safe coordinate access. Reported
  by Nick Bruun. GitHub #5.