update readme and screenshot

git-svn-id: https://plugins.svn.wordpress.org/nino-social-connect/trunk@945435 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme v1.1.1

git-svn-id: https://plugins.svn.wordpress.org/nino-social-connect/trunk@945437 b8457f37-d9ea-0310-8a92-e5e31aec5664