title: (FirebaseFireStoreSwift Pod) ld: 201 duplicate symbols for architecture x86_64
body: <p>Hi I am trying to add the <code>FirebaseFirestoreSwift</code> pod to my project so I can encode and decode custom objects with FireStore. My project was running but I added it to my podfile and get some duplicate errors when building. (Build succeeds when I remove it from my Podfile.</p>
  <pre><code>duplicate symbol '_OBJC_CLASS_$_FIRAnalyticsConfiguration' in:
  /Users/~/Library/Developer/Xcode/DerivedData/community-garden-ios-duyohzbycrzylgdmgnstqtwukjjf/Build/Products/Debug-iphonesimulator/FirebaseCore.o
  /Users/~/Library/Developer/Xcode/DerivedData/community-garden-ios-duyohzbycrzylgdmgnstqtwukjjf/Build/Products/Debug-iphonesimulator/FirebaseCore/FirebaseCore.framework/FirebaseCore(FIRAnalyticsConfiguration.o)
  </code></pre>
  <p>You can view complete error <a href="https://gist.github.com/Pape98/02d89c6aeb025151b11aa2599c972882" rel="nofollow noreferrer">here</a></p>
  <p>I am a newbie to iOS and I have spent days researching the problem but most Stackoverflow posts deal with people writing objective C-code. I've tried to look compiled sources but no files were linked twice.</p>
  <p>This image shows the targets of my Pods</p>
  <p><a href="https://i.stack.imgur.com/i0AiB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i0AiB.png" alt="enter image description here" /></a></p>