title: Error: An appName, publicServerURL, and emailAdapter are required for password reset and email verification functionality
body: <p>I have an iOS mobile app written in Swift. I am using Parse Server as my backend and I am trying to implement password reset. The documentation only suggests adding the code below which I have done.</p>
  
  <p><code>PFUser.requestPasswordResetForEmailInBackground("email@example.com")</code></p>
  
  <p>However, I get the error <strong>An appName, publicServerURL, and emailAdapter are required for password reset and email verification functionality</strong>. I have found a lot of material on implementing Mailgun with parse to make this work but they are all in Javascript. Do I have to implement Mailgun in Swift? If so, how do I do it?</p>