优化error输出

cmd/saastool/task.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os"
 	"strings"
 )
 
@@ -30,10 +29,7 @@ func RunTask(args ...string) error {
 	case "run":
 		return RunTaskRun(args...)
 	default:
-		err := fmt.Errorf(`unknown command "%s"`+"\n"+`Run 'saastool task help' for usage`, name)
-		fmt.Fprintln(os.Stderr, err)
-
-		return err
+		return fmt.Errorf(`Unknown command "%s"`+"\n"+`Run 'saastool task help' for usage`, name)
 	}
 }