Change readme

git-svn-id: https://plugins.svn.wordpress.org/wordiz-most-shared-articles-for-authors/trunk@956422 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated and deprecate old plugin

git-svn-id: https://plugins.svn.wordpress.org/wordiz-most-shared-articles-for-authors/trunk@956423 b8457f37-d9ea-0310-8a92-e5e31aec5664