[fix]code

constant/rule.go

@@ -12,6 +12,7 @@ const (
 	SrcPort
 	DstPort
 	Process
+	RuleSet
 	Script
 	MATCH
 )
@@ -40,6 +41,8 @@ func (rt RuleType) String() string {
 		return "DstPort"
 	case Process:
 		return "Process"
+	case RuleSet:
+		return "RuleSet"
 	case Script:
 		return "Script"
 	case MATCH: