small readme fix

git-svn-id: https://plugins.svn.wordpress.org/go-taxonomy/trunk@1023510 b8457f37-d9ea-0310-8a92-e5e31aec5664
another small readme fix

git-svn-id: https://plugins.svn.wordpress.org/go-taxonomy/trunk@1023513 b8457f37-d9ea-0310-8a92-e5e31aec5664