readme

git-svn-id: https://plugins.svn.wordpress.org/baidu-sitemap-generator/trunk@1053884 b8457f37-d9ea-0310-8a92-e5e31aec5664
1.6.2

git-svn-id: https://plugins.svn.wordpress.org/baidu-sitemap-generator/trunk@1053887 b8457f37-d9ea-0310-8a92-e5e31aec5664