title: microsoft bot framework to open a url without user intervention
body: <p>There are hero card or thumbnail card examples where you can render a button to open a URL like below</p>
  
  <pre><code> msg.attachments([ 
          new builder.ThumbnailCard(session)
          .title('Brian Mathew')
          .subtitle('CIO, Logistics')
          .text('San Francisco Bay Area - 30 Mutual Connections')
          .images([
              builder.CardImage.create(session, 'https://media.licdn.com/dms/image/C5103AQHt4Rp2MT0quA/profile-displayphoto-shrink_800_800/0?e=1527022800&amp;v=alpha&amp;t=gQbe7EXQX1S3wYr8QpCjXqeWyKzM0vQWE0M51WGL8n4')
          ])
          .buttons([
              builder.CardAction.openUrl(session, 'https://google.com', 'More Details')
          ])
  </code></pre>
  
  <p>However, in my use case, I do not want to show any button for an explicit call and simply let user take to the url. Take it like saying Open google.com. I could not find a way to do that plz advise</p>