recipes/goto-last-change: update to pull from GitHub

Got permission from the author to host this on GitHub, allowing us to
tag for MELPA Stable:

> Date: Wed, 17 Dec 2014 09:26:03 -0700
> Subject: Re: goto-last-change.el
> From: Kevin Rodgers <kevin.d.rodgers@gmail.com>
> To: Cameron Desautels <camdez@gmail.com>
>
> Hi Cameron,
>
> Thanks for the info, I had no idea about such dependencies.  I'm
> pleased to hear that it is being used, but at the moment I don't have
> a working development machine so I can't handle the Git upload and
> tagging.  I'd really appreciate it if you would take care of that and
> host goto-last-change.el on MELPA.