func Infof(format string, v ...interface{}) {
	infoLogger.Output(2, fmt.Sprintf(format, v...))
}
INFO print with formatting
package log
import (
	"fmt"
	"log"
	"os"
)
var infoLogger = log.New(os.Stdout, "INFO: ", log.Ldate|log.Ltime|log.Lshortfile)
var warnLogger = log.New(os.Stdout, "WARN: ", log.Ldate|log.Ltime|log.Lshortfile)
var errorLogger = log.New(os.Stderr, "ERROR: ", log.Ldate|log.Ltime|log.Lshortfile)
func Info(v ...interface{}) {
	infoLogger.Output(2, fmt.Sprint(v...))
}