Update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/pinit/trunk@1020188 b8457f37-d9ea-0310-8a92-e5e31aec5664
Delete pinit.js in trunk

git-svn-id: https://plugins.svn.wordpress.org/pinit/trunk@1020191 b8457f37-d9ea-0310-8a92-e5e31aec5664