github account location in the readme

git-svn-id: https://plugins.svn.wordpress.org/wp-old-post-date-remover/trunk@1025251 b8457f37-d9ea-0310-8a92-e5e31aec5664
github account location in the readme

git-svn-id: https://plugins.svn.wordpress.org/wp-old-post-date-remover/trunk@1025254 b8457f37-d9ea-0310-8a92-e5e31aec5664