Update github API usage

[compwron]

On February 4th, 2020 at 01:58 (UTC) your application (Double Union) used an access token (with the User-Agent Faraday v0.15.4) as part of a query parameter to access an endpoint through the GitHub API.
https://api.github.com/user
Please use the Authorization HTTP header instead as using the access_token query parameter is deprecated.
Depending on your API usage, we’ll be sending you this email reminder once every 3 days for each token and User-Agent used in API calls made on your behalf.
Just one URL that was accessed with a token and User-Agent combination will be listed in the email reminder, not all.
Visit https://developer.github.com/changes/2019-11-05-deprecated-passwords-and-authorizations-api/#authenticating-using-query-parameters for more information.

[anaulin]

This seems a few months old. Does this still need fixing, @compwron ?