updating readme

git-svn-id: https://plugins.svn.wordpress.org/stockists-manager/trunk@1041303 b8457f37-d9ea-0310-8a92-e5e31aec5664
updating readme

git-svn-id: https://plugins.svn.wordpress.org/stockists-manager/trunk@1041305 b8457f37-d9ea-0310-8a92-e5e31aec5664