readme.txt file updated

git-svn-id: https://plugins.svn.wordpress.org/wpfixedverticalfeedbackbutton/trunk@1054585 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt  updated once again.

git-svn-id: https://plugins.svn.wordpress.org/wpfixedverticalfeedbackbutton/trunk@1054587 b8457f37-d9ea-0310-8a92-e5e31aec5664