Change soon-to-be deprecated Basic authentication

[lsurinx]

Deprecation Notice: GitHub will discontinue password authentication to the API. You must now authenticate to the GitHub API with an API token, such as an OAuth access token, GitHub App installation access token, or personal access token, depending on what you need to do with the token. For more information, see the blog post.

https://developer.github.com/changes/2019-11-05-deprecated-passwords-and-authorizations-api/