Updated missing url https://cdn.rawgit.com/twbs/bootstrap/v4-dev/dist/js/bootstrap.js to https://cdn.jsdelivr.net/gh/twbs/bootstrap/v4-dev/dist/js/bootstrap.js
https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js
https://cdn.rawgit.com/twbs/bootstrap/v4-dev/dist/js/bootstrap.js