Updated API url to https

git-svn-id: https://plugins.svn.wordpress.org/flickr-api/trunk@954208 b8457f37-d9ea-0310-8a92-e5e31aec5664
update changelog

git-svn-id: https://plugins.svn.wordpress.org/flickr-api/trunk@954209 b8457f37-d9ea-0310-8a92-e5e31aec5664