readme file update

git-svn-id: https://plugins.svn.wordpress.org/flat-floating-social-bar/trunk@950702 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme file update

git-svn-id: https://plugins.svn.wordpress.org/flat-floating-social-bar/trunk@950705 b8457f37-d9ea-0310-8a92-e5e31aec5664