update readme

git-svn-id: https://plugins.svn.wordpress.org/enhanced-tooltipglossary/trunk@869740 b8457f37-d9ea-0310-8a92-e5e31aec5664
version 2.6.2

git-svn-id: https://plugins.svn.wordpress.org/enhanced-tooltipglossary/trunk@869804 b8457f37-d9ea-0310-8a92-e5e31aec5664