<!doctype html>
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <title>Web Application Starter Project</title>
  </head>
  <body>
    <h1>Hello</h1>
    <script type="text/javascript" src="gwtdragula/gwtdragula.nocache.js"></script>
  </body>
</html>

<!doctype html>
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <title>Web Application Starter Project</title>
  </head>
  <body>
    <h1>Hello</h1>
    <script src="gwtdragula/gwtdragula.nocache.js"></script>
  </body>
</html>

Remove type from script tag
Remove type from script tag