title: Alamofire Error After updating to latest version
body: <p>I am facing an issue an issue after updating to the latest version of Alamofire 4.x where by the myRequest.response (line 2) gives error 'Cannot call value of non-function type 'HTTPURLResponse?'. I have been using this code without any issues for quite some time. Can someone please help?</p>
  
  <pre><code>let queue = DispatchQueue(label: "com.cnoon.manager-response-queue", attributes: DispatchQueue.Attributes.concurrent)        
  let myRequest = Alamofire.request(myURL, method: .get, headers: headers)
          myRequest.response (
              queue: queue,
              responseSerializer: Request.JSONResponseSerializer(options: .allowFragments),
              completionHandler:
              { response in
                  switch response.result {
                  case .success:
                      print(response.timeline)
                      if let httpStatusCode = response.response?.statusCode {
                          switch (httpStatusCode) {
                          case 200:
                              if let myValue = response.result.value {
                                  updateSuccessful = StorageMethod.sharedInstance.updateRoutine(JSON(myValue))
                                  print(updateSuccessful)
                                  print("HERE")
                                  //print(myJSON)
                                  //let status_m = myJSON["dates"]["market_status"].stringValue
                                  //print(status_m)
                              }
                          case 401:
                              customErrorMessage = "Session expired: Please exit app and re-login."
                              updateSuccessful = false
                          default:
                              customErrorMessage = "Error: Please try again."
                              updateSuccessful = false
                          }
                      }
                  case .failure(let error):
                      if error.code == -1009 {
                          updateSuccessful = false
                          customErrorMessage = error.localizedDescription
                      }
                      else {
                          updateSuccessful = false
                          customErrorMessage = error.localizedDescription + "Hi"
                      }
  
                      //print(error)
  
                  }
  
                  DispatchQueue.main.async {
  
                      if (updateSuccessful) {
                          self.refreshMasterData()
                      }
  
                      else {
                          self.refreshMasterData()
                          if let tabControl = self.tabBarController?.view {
                              tabControl.makeToast(customErrorMessage, duration: 3.0, position: .center)
                          }
                      }
  
                      if (self.refreshControl.isRefreshing) {
                          self.showRefreshControl(false)
                      }
  
                      self.delegate?.portfolioTableViewControllerRefreshDrag(false)
                      StorageMethod.sharedInstance.dataUpdating = false
                  }
              }
  
          )
  </code></pre>