developer name and link changed

git-svn-id: https://plugins.svn.wordpress.org/google-xml-sitemap-generator-by-anton-dachauer/trunk@1038552 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme and developer credits


git-svn-id: https://plugins.svn.wordpress.org/google-xml-sitemap-generator-by-anton-dachauer/trunk@1038554 b8457f37-d9ea-0310-8a92-e5e31aec5664