Update of readme.txt files

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@938645 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update trunk version

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@938646 b8457f37-d9ea-0310-8a92-e5e31aec5664