title: Alamofire Type 'ParameterEncoding' has no member 'URL' Swift 3
body: <p>I am trying to migrate my codes from swift 2 version to swift 3 version.
  I could not migrate following code part and I did not find any solution for it.
  How can I do it?</p>
  
  <p>// MARK: URLRequestConvertible</p>
  
  <pre><code>     public var URLRequest: NSMutableURLRequest {
              let urlComponent = NSURLComponents(string: Router.baseURL)!
              urlComponent.path = Router.basePath.stringByAppendingString(path)
  
              let mutableURLRequest = NSMutableURLRequest(URL: urlComponent.URL!)
              mutableURLRequest.HTTPMethod = method.rawValue
  
              var parameters: [String: AnyObject] = Dictionary()
              parameters["key"] = Router.key
              parameters["hl"] = "en"
  
              switch self {
              case .getMostPopularVideos(let pageToken):
                  parameters["part"] = "snippet,contentDetails,statistics"
                  parameters["chart"] = "mostPopular"
                  parameters["videoCategoryId"] = TubeTrends.Settings.topTrendsCat
                  if let pageToken = pageToken {
                          parameters["pageToken"] = pageToken
                  }
                  return Alamofire.ParameterEncoding.URL.encode(mutableURLRequest, parameters: parameters).0  //This part Giving Error like Alamofire Type 'ParameterEncoding' has no member 'URL'
  
  //            default:
  //                return mutableURLRequest
              }
          }
      }
  </code></pre>