update w/ new readme.txt text

git-svn-id: https://plugins.svn.wordpress.org/schedulista-shortcode/trunk@913054 b8457f37-d9ea-0310-8a92-e5e31aec5664
update w/ new readme.txt text

git-svn-id: https://plugins.svn.wordpress.org/schedulista-shortcode/trunk@913055 b8457f37-d9ea-0310-8a92-e5e31aec5664