title: App crash - AuthenticationServices Library not loaded
body: <p>I'm trying to use AppAuth-iOS dev-logout branch and I tested on simulator 10.3.1.
  When I try to run the code I get this crash:</p>
  
  <blockquote>
    <p>dyld: Library not loaded:
    /System/Library/Frameworks/AuthenticationServices.framework/AuthenticationServices
    Reason: image not found</p>
  </blockquote>
  
  <p>AuthenticationServices only appeared in iOS 12.0+, so this may be the cause of the crash.</p>
  
  <p>Link to github issue: <a href="https://github.com/openid/AppAuth-iOS/issues/350" rel="noreferrer">https://github.com/openid/AppAuth-iOS/issues/350</a></p>
  
  <p>Thanks for any hint!</p>