config.js should be in .gitignore

[BoredKevin]

Hi there, I think that the config.js file should be added to the .gitignore file to ensure that important variables containing sensitive information are not tracked by Git and are not pushed to the remote repository.

Some people run this bot by forking it and since config.js isn't a standard way of keeping secrets, I think it should be important to add it to .gitignore