fix: ProductListOptions are missing some fields (#253) (#271)

- add field `title`

Co-authored-by: ShuQingZai <overbeck.jack@idd.cool>

product.go

@@ -101,6 +101,7 @@ type ProductListOptions struct {
 	PublishedStatus       string          `url:"published_status,omitempty"`
 	PresentmentCurrencies string          `url:"presentment_currencies,omitempty"`
 	Status                []ProductStatus `url:"status,omitempty,comma"`
+	Title                 string          `url:"title,omitempty"`
 }
 
 // Represents the result from the products/X.json endpoint