title: enabling/disabling Crashlytics at runtime in iOS app
body: <p>Can't seem to enable/disable Crashlytics at runtime by a method call in swift - my app is setup with firebase analytics and Crashlytics for firebase - the following call (per the <a href="https://firebase.google.com/docs/crash/disable-sdk" rel="noreferrer">Google dev website</a>) gives me "<strong>Use of unresolved identifier 'Crash'</strong>" even when importing crashlytics and firebase</p>
  
  <pre><code>Crash.sharedInstance().crashCollectionEnabled = false
  </code></pre>