deleting old readme

git-svn-id: https://plugins.svn.wordpress.org/category-widget/trunk@838187 b8457f37-d9ea-0310-8a92-e5e31aec5664
newer version 1.4.2.1 added

git-svn-id: https://plugins.svn.wordpress.org/category-widget/trunk@838188 b8457f37-d9ea-0310-8a92-e5e31aec5664