readme.txt update


git-svn-id: https://plugins.svn.wordpress.org/wp-social-blocks/trunk@783932 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update


git-svn-id: https://plugins.svn.wordpress.org/wp-social-blocks/trunk@783933 b8457f37-d9ea-0310-8a92-e5e31aec5664