Update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/main-category-as-subdomain/trunk@1007889 b8457f37-d9ea-0310-8a92-e5e31aec5664
Remove Error

git-svn-id: https://plugins.svn.wordpress.org/main-category-as-subdomain/trunk@1007890 b8457f37-d9ea-0310-8a92-e5e31aec5664