readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/kento-post-view-counter/trunk@862929 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/kento-post-view-counter/trunk@867356 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/kento-post-view-counter/trunk@869022 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/kento-post-view-counter/trunk@869024 b8457f37-d9ea-0310-8a92-e5e31aec5664