title: Value of type 'StorageMetadata' has no member 'downloadURL'
body: <p>Hey I need help with this coding, i'm not sure what has happened. It was working the other day. The error comes up after <code>if let ur; = metaData?.downladURL()</code></p>
  
  <pre><code>func uploadProfileImage(_ image:UIImage, completion: @escaping ((_ url:URL?)-&gt;())) {
          guard let uid = Auth.auth().currentUser?.uid else { return }
          let storageRef = Storage.storage().reference().child("user/\(uid)")
  
          guard let imageData = UIImageJPEGRepresentation(image, 0.75) else { return }
  
          let metaData = StorageMetadata()
          metaData.contentType = "image/jpg"
  
          storageRef.putData(imageData, metadata: metaData) { metaData, error in
              if error == nil, metaData != nil {
                  if let url = metaData?.downloadURL() {
                      completion(url)
                  } else {
                      completion(nil)
                  }
                  // success!
              } else {
                  // failed
                  completion(nil)
              }
          }
      }
  </code></pre>