access to raw update json added

bot.go

@@ -515,6 +515,7 @@ func (bot *BotAPI) ListenForWebhook(pattern string) UpdatesChannel {
 
 		var update Update
 		json.Unmarshal(bytes, &update)
+		update.RawUpdateJson = string(bytes)
 
 		ch <- update
 	})

types.go

@@ -37,6 +37,7 @@ type Update struct {
 	CallbackQuery      *CallbackQuery      `json:"callback_query"`
 	ShippingQuery      *ShippingQuery      `json:"shipping_query"`
 	PreCheckoutQuery   *PreCheckoutQuery   `json:"pre_checkout_query"`
+	RawUpdateJson      string
 }
 
 // UpdatesChannel is the channel for getting updates.