title: Firebase Configuration Issue : Firebase Analytics is not available
body: <p>As I integrated Firebase push notifications in Xcode swift project.
  I am not using pod files for using firebase.
  I am getting configuration issue</p>
  
  <ul>
  <li>[Firebase/Core][I-COR000022] Firebase Analytics is not available. To add it, include Firebase/Core in the Podfile or add FirebaseAnalytics</li>
  </ul>
  
  <p>[FIRInstanceIDCheckinPreferences preferencesFromKeychainContents:]: unrecognized selector sent to class 0x46efec</p>