Turned off notice in README.

README.md

 VuFind
 ======
 
-NOTICE
-------
-VuFind development has moved to GitHub. See https://github.com/vufind-org/vufind
-for more details. The SourceForge Git repo will be shut down as of August 26,
-2013. SourceForge will continue to be used for VuFind 1.x SVN development, mailing
-lists, news, etc.
-
 Introduction
 ------------
 VuFind is an open source discovery environment for searching a collection of