Merge pull request #166 from juanfont/complete-expire-command

Improve help message to expire key

cmd/headscale/cli/preauthkeys.go

@@ -131,7 +131,7 @@ var createPreAuthKeyCmd = &cobra.Command{
 }
 
 var expirePreAuthKeyCmd = &cobra.Command{
-	Use:   "expire",
+	Use:   "expire KEY",
 	Short: "Expire a preauthkey",
 	Args: func(cmd *cobra.Command, args []string) error {
 		if len(args) < 1 {