Updated <? <?php correction error on line 453

git-svn-id: https://plugins.svn.wordpress.org/network-posts-extended/trunk@1041320 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed me readme.txt version correction

git-svn-id: https://plugins.svn.wordpress.org/network-posts-extended/trunk@1041323 b8457f37-d9ea-0310-8a92-e5e31aec5664