update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/facebook-by-weblizar/trunk@961205 b8457f37-d9ea-0310-8a92-e5e31aec5664
commit 0.4

git-svn-id: https://plugins.svn.wordpress.org/facebook-by-weblizar/trunk@961206 b8457f37-d9ea-0310-8a92-e5e31aec5664