func (l *Logger) Warn(args ...interface{}) {
	l.Output(2, LevelWarn, fmt.Sprint(args...))
}
func (l *Logger) Warn(args ...interface{}) {
	l.Output(2, LevelWarn, fmt.Sprint(args...))
}
func ( l * Logger ) Warn ( args ... interface { } ) { l . Output ( 2 , LevelWarn , fmt . Sprint ( args ... ) ) }
// Warn records the log with warn level
Warn records the log with warn level