simplify json format

cmd/root.go

@@ -28,10 +28,7 @@ import (
 var preset string
 var scriptPath string
 
-type script struct {
-	Presets []string
-	Times   []float64
-}
+type script []string
 
 func (s *script) load(path string) error {
 	f, err := os.Open(path)
@@ -54,7 +51,7 @@ func getPresets() []string {
 	if scriptPath != "" {
 		var s script
 		s.load(scriptPath)
-		presets = s.Presets
+		presets = s
 	}
 
 	return presets