Based on Nicola Ferraro's quickstart repo. This project provides a simple telegram bot integration for Github Notifications.
The premise is simple; you (the user) should create a telegram bot. During the bot creation process take note of the HTTP API access token (Lets call it TELEGRAM_AUTH_TOKEN). Then head over to your Github account and generate a personal access token (Lets call this one GITHUB_AUTH_TOKEN). Grant it at least the notifications & repo privileges. Finally, start a chat with your telegram bot and get that chat id (Unfortunately this requires a bit of creativity and Googling from your part). Lets assume you did it and now we call that final parameter TELEGRAM_CHAT_ID.
As for how to run it, refer to the Heroku's Procfile.