title: Dialogflow slack integration is broken?
body: <p>Im trying to publish a bot in my slack workspace, but seems thatdialogflow  integration with slack is broken :/</p>
  <p>I run some tests and find out that app in slack is sending the payload to dialogflow, but this dont respond back at all.</p>
  <p>I follow all the steps on the tutorial but the documentation of dialogflow seems out of date.</p>
  <p>Anyone knows if the best way to integrate both is trought dialogflow integration or have other way?</p>
  <p>Thanks</p>