readme edits

git-svn-id: https://plugins.svn.wordpress.org/wp-motion/trunk@972351 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme edits

git-svn-id: https://plugins.svn.wordpress.org/wp-motion/trunk@972359 b8457f37-d9ea-0310-8a92-e5e31aec5664