[PATCH] [graphite] document that isl-0.16 is supported

[Mike Stump]

On Feb 2, 2016, at 2:23 AM, Sebastian Huber <sebastian.huber@embedded-brains.de> wrote:
> It would be good to have a recommended version as well (similar for cloog, gmp, mpc and mpfr). If you present me three versions which one should I choose as a naive user?

The latest release, or the one on your system.  This is so basic that we expect you to already know this.

> Are the versions in the contrib/download_prerequisites script the recommended ones?

Yes, they are.