func SetLevel(level Level) {
	std.mu.Lock()
	defer std.mu.Unlock()
	std.SetLevel(level)
}
SetLevel sets the standard logger level.
package logrus
import (
	"io"
)
var (
	std = New()
)
func StandardLogger() *Logger {
	return std
}
func SetOutput(out io.Writer) {
	std.mu.Lock()
	defer std.mu.Unlock()
	std.Out = out
}
func SetFormatter(formatter Formatter) {
	std.mu.Lock()
	defer std.mu.Unlock()
	std.Formatter = formatter
}