readme.txt modifications

git-svn-id: https://plugins.svn.wordpress.org/auto-sticky-post/trunk@844237 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/auto-sticky-post/trunk@844240 b8457f37-d9ea-0310-8a92-e5e31aec5664