func (l *DefaultLogger) Warn(args ...interface{}) {
	log.Println(args...)
}
Warn logs warn level information to stdout.
package curlyq
import (
	"log"
)
type Logger interface {
	Debug(...interface{})
	Info(...interface{})
	Warn(...interface{})
	Error(...interface{})
}
type DefaultLogger struct{}
func (l *DefaultLogger) Debug(args ...interface{}) {}
func (l *DefaultLogger) Info(args ...interface{}) {
	log.Println(args...)
}