fix GeoIP2 and Geoip providers encoding

@see:
https://github.com/geocoder-php/Geocoder/blob/2.x/src%2FGeocoder%2FProvider%2FGeoIP2Provider.php#L65
@see:
https://github.com/geocoder-php/Geocoder/blob/2.x/src%2FGeocoder%2FProvider%2FGeoipProvider.php#L61