I know this is old, but people still have problems with the host choice, this answer is for these people.
Github by itself CAN'T host Discord bots! But you can export it to another platforms, here is some of them:
Heroku
Heroku is used by the most Developers in Discord. You can also export from the command-line Git.
This Medium article is a good introduction to Heroku. But you can also check this.
Repl.it
If you like 'open-source-bots' host, then you can use Repl.it, it hiddens the `.env` file, and you can export from Github.
You can learn how to host in JS and Python in its forum.
PythonAnywhere
This is an less-used tool, with it you can emulate Bashes and Python consoles.
You can run scripts too, but i didn't find any tutorial explaining how-to run Discord bots.
So, it's all, bye!
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…