Documentation missing SPM support #157
Description
The Firebase Firestore documentation (https://firebase.google.com/docs/firestore/solutions/geoqueries#swift_2) and Firebase Open Source (https://firebaseopensource.com/projects/firebase/geofire-objc/) only mention Cocoapods as an installation method for GeoFire, but installing via Swift Package Manager works when selecting the main branch instead of a version rule.