Add pyup badge

Signed-off-by: alfred richardsn <rchrdsn@protonmail.ch>

README.md

@@ -2,6 +2,7 @@
 
 # TellerBot
 [![Documentation Status](https://readthedocs.org/projects/tellerbot/badge/?version=latest)](https://tellerbot.readthedocs.io/en/latest/?badge=latest)
+[![Updates](https://pyup.io/repos/github/fincubator/tellerbot/shield.svg)](https://pyup.io/repos/github/fincubator/tellerbot)
 [![GitHub license](https://img.shields.io/github/license/fincubator/tellerbot)](https://github.com/PreICO/tellerbot/blob/escrow/COPYING)
 [![Telegram](https://img.shields.io/badge/Telegram-tellerchat-blue?logo=telegram)](https://t.me/tellerchat)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)