Removed capital README.txt

git-svn-id: https://plugins.svn.wordpress.org/impactpubs/trunk@768360 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added Stable tag

git-svn-id: https://plugins.svn.wordpress.org/impactpubs/trunk@768361 b8457f37-d9ea-0310-8a92-e5e31aec5664