Show PNG image when the bot send a pictogram with sendPhoto method

[truki]

When the bot send a image with sendPhot (send_photo on PythonTelegram bot), the image that show and we can open to download later is JPG format.
if is possible the image format must be PNG.

[truki]

suggestion saw on Python Telegram Bot group:

f=io.BufferedReader(BytesIO(b))
bot.sendPhoto(chat_id=chat_id,photo=f)