func SafeErrPrintf(msg string, a ...interface{}) {
	stderrMux.Lock()
	defer stderrMux.Unlock()
	ErrPrintf(msg, a...)
}
SafeErrPrintf is a thread-safe wrapper to ErrPrintf
package cmdutil
import (
	"fmt"
	"io"
	"os"
	"sync"
	"time"
	"github.com/fatih/color"
)
var Stdout io.Writer = os.Stdout
var Stderr io.Writer = os.Stderr
var ColoredStderr io.Writer = color.Error
var stdoutMux sync.Mutex
var stderrMux sync.Mutex
func ErrPrintf(msg string, a ...interface{}) {
	_, err := fmt.Fprintf(ColoredStderr, color.RedString(msg), a...)
	if err != nil {
		panic(err)
	}
}