Tweak to readme to denote dependency on GFX in 1.3.  refs #8551
Tweak to readme to denote dependency on GFX in 1.3.  refs #8551

git-svn-id: ee6e786acc44c9cca5ee17c71a5576c45c210361@16656 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful