title: Sending images or buttons on facebook messenger via ibm watson configuered via botkit
body: <p>I have made a wotson chat bot, deployed on facebbok messenger the broker is a node app just like in <a href="https://github.com/watson-developer-cloud/botkit-middleware" rel="nofollow noreferrer">this github example</a>. I'm recieving text responses perfectly but how do I configure the bot to send images or buttons to the fb messenger. I have tried Respond with JSON option in watson dialog.
  JSON:</p>
  
  <pre><code>{
    "output": {
  
    },
  "context":{
  "facebook":{
    "message":{
      "attachment":{
          "type":"image",
          "payload":{
              "url":"https://petersapparel.com/img/shirt.png"
          }
      }
    }
  }
  }
  }
  </code></pre>
  
  <p>I Think there is some problem with my JSON.</p>