Accommodate 303 in /me/following/:id

The API endpoint /me/following/:id returns 404 (Not Found) if
authenticated user does not follow :id. It returns 303 (See Other)
redirecting to /users/:id. Because the response is not 2XX (Success),
the client returns ResponseError.

This change allows 2XX (Success) and 3XX (Redirection) - not returning
ResponseError.

When redirection occurs, it is my understanding that authentication
information is not passed on - resulting in 401 (Not Authorized). So
this change also sets follow_redirects to false, so that redirection does
not happen