readme changes

git-svn-id: https://plugins.svn.wordpress.org/viral-sharing-buttons-by-up/trunk@991435 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme change

git-svn-id: https://plugins.svn.wordpress.org/viral-sharing-buttons-by-up/trunk@991436 b8457f37-d9ea-0310-8a92-e5e31aec5664