Update README.md

Author: advnpzn

README.md

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 # Akinator-Bot
 A Telegram bot where you can play the Akinator Guessing game.
+# This is a development branch!
 check out `@aki_akinator_bot` on Telegram.
 # Deploy to heroku by clicking on the button below..
 [![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://dashboard.heroku.com/new?button-url=https%3A%2F%2Fgithub.com%2Fadenosinetp10%2FAkinator-bot&template=https%3A%2F%2Fgithub.com%2Fadenosinetp10%2FAkinator-bot