title: Suggestion chip for Actions on Google doesn't work in API.AI
body: <p>I have the following JSON sent as response to API.AI webhook:</p>
  
  <pre><code>{
      "speech": "Hello World",
      "data": {
          "google": {
              "richResponse": {
                  "suggestions": [
                      {
                          "title": "Foo"
                      },
                      {
                          "title": "Bar"
                      }
                  ]
              },
              "expectUserResponse": true,
              "isSsml": false
          }
      }
  }
  </code></pre>
  
  <p>It makes Google Assistant to disconnect my bot ("XXX isn't responding right now. Try again soon.") If I remove the <code>richResponse</code> part, it works (returns "Hello World").</p>
  
  <p>How do I send suggestion chips?</p>