Update readme for WP 4.1

git-svn-id: https://plugins.svn.wordpress.org/katalyst-video-plus/trunk@1048590 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme for WP 4.1 (Fixed link)

git-svn-id: https://plugins.svn.wordpress.org/katalyst-video-plus/trunk@1048600 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed readme donate link

git-svn-id: https://plugins.svn.wordpress.org/katalyst-video-plus/trunk@1048602 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed readme typo

git-svn-id: https://plugins.svn.wordpress.org/katalyst-video-plus/trunk@1048607 b8457f37-d9ea-0310-8a92-e5e31aec5664