updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/free-stock-photos-by-mystockphotocom/trunk@916888 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/free-stock-photos-by-mystockphotocom/trunk@916890 b8457f37-d9ea-0310-8a92-e5e31aec5664