tweak to readme

git-svn-id: https://plugins.svn.wordpress.org/sexy-author-bio/trunk@1053243 b8457f37-d9ea-0310-8a92-e5e31aec5664
removed periods.

git-svn-id: https://plugins.svn.wordpress.org/sexy-author-bio/trunk@1053245 b8457f37-d9ea-0310-8a92-e5e31aec5664