title: Value of type 'EditProfileVc' has no member 'storageRef' in swift 4
body: <p><img src="https://i.stack.imgur.com/kHStf.png" alt="Click here for image">  </p>
  
  <pre><code>func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
              profileImage.image = image
              dismiss(animated: true, completion: nil)
              var data = NSData()
              data = UIImageJPEGRepresentation(profileImage.image!, 0.8)! as NSData
              // set upload path
              let filePath = "\(Auth.auth().currentUser!.uid)/\("userPhoto")"
              let metaData = StorageMetadata()
              metaData.contentType = "image/jpg"
              self.storageRef.child(filePath).putData(data, metadata: metaData){(metaData,error) in
                  if let error = error {
                      print(error.localizedDescription)
                      return
                  }else{
                      //store downloadURL
                      let downloadURL = metaData!.downloadURL()!.absoluteString
                      //store downloadURL at database
                      self.databaseRef.child("users").child(FIRAuth.auth()!.currentUser!.uid).updateChildValues(["userPhoto": downloadURL])
                  }
  
              }
          }
  </code></pre>