Release version 2.17.0

git-svn-id: https://plugins.svn.wordpress.org/testimonials-widget/trunk@821486 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update requirements

git-svn-id: https://plugins.svn.wordpress.org/testimonials-widget/trunk@821488 b8457f37-d9ea-0310-8a92-e5e31aec5664