title: String(contentsOfURL:) in Swift 3
body: <p>This code from before:</p>
  
  <pre><code>if let resultOfURL = try? String(contentsOfURL:myURL!, encoding: String.Encoding.utf8) {
  </code></pre>
  
  <p>Is now throwing this error:</p>
  
  <pre><code>'init' has been renamed to 'init(describing:)'
  </code></pre>
  
  <p>Any help? Thanks so much!!</p>