minor readme-txt edit

git-svn-id: https://plugins.svn.wordpress.org/waterwoo-pdf/trunk@1017063 b8457f37-d9ea-0310-8a92-e5e31aec5664
minor readme.txt edit

git-svn-id: https://plugins.svn.wordpress.org/waterwoo-pdf/trunk@1017064 b8457f37-d9ea-0310-8a92-e5e31aec5664