update readme

git-svn-id: https://plugins.svn.wordpress.org/enhanced-tooltipglossary/trunk@785675 b8457f37-d9ea-0310-8a92-e5e31aec5664
update pro info

git-svn-id: https://plugins.svn.wordpress.org/enhanced-tooltipglossary/trunk@785678 b8457f37-d9ea-0310-8a92-e5e31aec5664
update to 2.3.9

git-svn-id: https://plugins.svn.wordpress.org/enhanced-tooltipglossary/trunk@789397 b8457f37-d9ea-0310-8a92-e5e31aec5664