included more pricing plans info in F.A.Q. of readme.txt

git-svn-id: https://plugins.svn.wordpress.org/landing-pages-builder/trunk@841924 b8457f37-d9ea-0310-8a92-e5e31aec5664
improved F.A.Q

git-svn-id: https://plugins.svn.wordpress.org/landing-pages-builder/trunk@841928 b8457f37-d9ea-0310-8a92-e5e31aec5664