title: Value of type 'Int' has no member 'rawValue'
body: <p>I cannot get my app to build in iOS. I receive the following error in Xcode in the "SwiftFlutterPlugin.swift" file</p>
  
  <p>Error:</p>
  
  <p>self.tmpWindow?.windowLevel = UIWindow.Level(baseWindowLevel! + 1.rawValue) Value of type 'Int' has no member 'rawValue'</p>
  
  <p>Any help is greatly appreciated!</p>