updated required version

git-svn-id: https://plugins.svn.wordpress.org/wp-screenshot/trunk@881758 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated description an required version

git-svn-id: https://plugins.svn.wordpress.org/wp-screenshot/trunk@881761 b8457f37-d9ea-0310-8a92-e5e31aec5664