Suggested authentication method is deprecated

[dcentrica]

As of Q4 2019, Github are deprecating API calls that use an access token as a query-string parameter (See: https://developer.github.com/changes/2019-11-05-deprecated-passwords-and-authorizations-api/#authenticating-using-query-parameters). Unfortunately, this is the suggested method to use when reviewing this module's README and which will result in your being emailed daily by GH telling you that this type of request is deprecated.

A quick fix for this would be to use the alternative method that is suggested in the READMR, and make it the suggested method, in addition to some notes and a link to the github.com docs page above for the other.