Update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-video-gallery/trunk@942117 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-video-gallery/trunk@942119 b8457f37-d9ea-0310-8a92-e5e31aec5664