title: Facebook OpenGraphContent on swift3
body: <p>I have tried to integrate an Open Graph Story with the latest Facebook SDK for Swift but I receive an error "generic parameter 'Content' could not be inferred"</p>
  
  <pre><code>let object: OpenGraphObject = [
      "og:type": "books.book",
      "og:title": "A Game of Thrones",
      "og:description": "In the frozen wastes to the north of Winterfell, sinister and supernatural forces are mustering.",
      "books:isbn": "0-553-57340-3"
  ]
  // Create an action
  var action = OpenGraphAction(type: "book.reads")
  action["books:book"] = object
  // Create the content
  var content = OpenGraphShareContent()
  content.action = action
  content.previewPropertyName = "books:book"
  try ShareDialog.show(from: self, content: content) //Here i'm getting "generic parameter 'Content' could not be inferred" 
  </code></pre>
  
  <p>Anyone knows a solution?</p>