updating screenshots

git-svn-id: https://plugins.svn.wordpress.org/wp-promo-emails/trunk@1012999 b8457f37-d9ea-0310-8a92-e5e31aec5664
screenshot

git-svn-id: https://plugins.svn.wordpress.org/wp-promo-emails/trunk@1013000 b8457f37-d9ea-0310-8a92-e5e31aec5664
screenshot

git-svn-id: https://plugins.svn.wordpress.org/wp-promo-emails/trunk@1013001 b8457f37-d9ea-0310-8a92-e5e31aec5664