support replied message's captions instead of text

bot.lua

@@ -73,6 +73,10 @@ on_msg_receive = function(msg) -- The fn run whenever a message is received.
 	if msg.date < os.time() - 5 then return end -- Do not process old messages.
 	if not msg.text then msg.text = msg.caption or '' end
 
+	if msg.reply_to_message and msg.reply_to_message.caption then
+		msg.reply_to_message.text = msg.reply_to_message.caption
+	end -- If the reply_to_msg contains a caption, set it as its text
+
 	if msg.text:match('^/start .+') then
 		msg.text = '/' .. msg.text:input()
 	end