Fix for plan and pricing link in readme

git-svn-id: https://plugins.svn.wordpress.org/ecwid-shopping-cart/trunk@1020096 b8457f37-d9ea-0310-8a92-e5e31aec5664
Another fix for that link

git-svn-id: https://plugins.svn.wordpress.org/ecwid-shopping-cart/trunk@1020097 b8457f37-d9ea-0310-8a92-e5e31aec5664