corrected mistake in readme file

git-svn-id: https://plugins.svn.wordpress.org/advanced-uploader/trunk@908783 b8457f37-d9ea-0310-8a92-e5e31aec5664
removed formating issues for upgrade notices

git-svn-id: https://plugins.svn.wordpress.org/advanced-uploader/trunk@908785 b8457f37-d9ea-0310-8a92-e5e31aec5664