Update language type to Language for consistency across MaxMind service

service/maxmind/mmdb/city.go

@@ -19,7 +19,7 @@ const (
 // City is a structure that contains information about the IP address.
 type City struct {
 	// lang is a language.
-	lang language
+	lang Language
 }
 
 // NewCity creates a new City instance.
@@ -27,7 +27,7 @@ type City struct {
 // @param logger - a logger
 // @param dir - a directory for storing MaxMind GeoIP2 database
 // @return geoip2.RefreshableGeoIP2 - a MaxMind GeoIP2 database service
-func NewCity(download *Download, logger geoip2.Logger, dir string, language language) geoip2.RefreshableGeoIP2 {
+func NewCity(download *Download, logger geoip2.Logger, dir string, language Language) geoip2.RefreshableGeoIP2 {
 	city := &City{
 		lang: language,
 	}