adjusted a minor issue with sales price floating value

git-svn-id: https://plugins.svn.wordpress.org/wpmarketplace/trunk@808147 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt updated

git-svn-id: https://plugins.svn.wordpress.org/wpmarketplace/trunk@808149 b8457f37-d9ea-0310-8a92-e5e31aec5664