title: resetting context in DialogFlow
body: <p>I want to be able to reset the context in my DialogFlow conversation. This is what I was trying:</p>
  
  <pre><code>func sendApiRequest(outgoing: String, isInitial: Bool) {
      let request = ApiAI.shared().textRequest()
      request?.query = [outgoing]
  
      if isInitial {
          let requestContext = AIRequestContext.init(name: "startup", andLifespan: 0, andParameters: nil)
          request?.requestContexts = [requestContext]
      }
      // (send and get response)
  </code></pre>
  
  <p>.. but this fails to reset the context. Is there a way?</p>