readme.txt updated

git-svn-id: https://plugins.svn.wordpress.org/prevent-content-copy-image-save/trunk@908182 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt updated

git-svn-id: https://plugins.svn.wordpress.org/prevent-content-copy-image-save/trunk@908184 b8457f37-d9ea-0310-8a92-e5e31aec5664