Add a `Botsbuildbots` function

A tribute to Portal 2, this function will return an infinite list of the
contents of the AUTHORS file on GitHub master (assuming requests is
installed). Except, the macro does this, the function never gets called,
it is purely there for tribute reasons.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
No, it is intentionally `defun`, because that's what is in the original, and the point of the function is to be 100% the same as in the Portal soundtrack.