Improved readme.txt

git-svn-id: https://plugins.svn.wordpress.org/person/trunk@876293 b8457f37-d9ea-0310-8a92-e5e31aec5664
Improved readme.txt

git-svn-id: https://plugins.svn.wordpress.org/person/trunk@876296 b8457f37-d9ea-0310-8a92-e5e31aec5664