func (t *HolidaysService) Countries(request *CountriesRequest) (*CountriesResponse, error) {
	rsp := &CountriesResponse{}
	return rsp, t.client.Call("holidays", "Countries", request, rsp)
}
Get the list of countries that are supported by this API
package holidays
import (
	"github.com/m3o/m3o-go/client"
)
func NewHolidaysService(token string) *HolidaysService {
	return &HolidaysService{
		client: client.NewClient(&client.Options{
			Token: token,
		}),
	}
}
type HolidaysService struct {
	client *client.Client
}