chore(logrus): avoid using stdlogger (#47)

Signed-off-by: rogerogers <[email protected]>

logrus/option.go

@@ -62,13 +62,13 @@ type config struct {
 }
 
 func defaultConfig() *config {
-	// std logger
-	stdLogger := logrus.StandardLogger()
+	// new logger
+	logger := logrus.New()
 	// default json format
-	stdLogger.SetFormatter(new(logrus.JSONFormatter))
+	logger.SetFormatter(new(logrus.JSONFormatter))
 
 	return &config{
-		logger: logrus.StandardLogger(),
+		logger: logger,
 		hooks:  []logrus.Hook{},
 	}
 }