fix NewConfig

tree.go

@@ -150,12 +150,14 @@ func NewConfig(
 	attachmentDirName string,
 	customMeta map[string]func() string,
 	excludes []string,
+	apps map[string]appCallback,
 ) Config {
 	return Config{
 		ReadableFormats:   readableFormats,
 		AttachmentDirName: attachmentDirName,
 		CustomMeta:        customMeta,
 		Excludes:          excludes,
+		Apps:              apps,
 	}
 }