Updating readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-gallery-custom-links/trunk@832405 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-gallery-custom-links/trunk@832410 b8457f37-d9ea-0310-8a92-e5e31aec5664