chore(all): move sub-packages to internal/provider

internal/provider/privatevpn/updater/countries.go

@@ -0,0 +1,14 @@
+package privatevpn
+
+import "strings"
+
+func codeToCountry(countryCode string, countryCodes map[string]string) (
+	country string, warning string) {
+	countryCode = strings.ToLower(countryCode)
+	country, ok := countryCodes[countryCode]
+	if !ok {
+		warning = "unknown country code: " + countryCode
+		country = countryCode
+	}
+	return country, warning
+}