Fixed readme typo

git-svn-id: https://plugins.svn.wordpress.org/role-quick-changer/trunk@996850 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed readme typo

git-svn-id: https://plugins.svn.wordpress.org/role-quick-changer/trunk@996852 b8457f37-d9ea-0310-8a92-e5e31aec5664