add changelog entry

firebase · Jul 4, 2022 · d7392a3 · d7392a3
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+- [Breaking change] Upgraded GeoFire to use the Firebase JS SDK v9. GeoFire no longer supports Firebase SDK below version 9.0.0
+- [Internal] Replace the `uglify` plugin with `terser`
+- See the migration guide (https://github.com/firebase/geofire-js/tree/master/migration#upgrading-from-geofire-3xx-to-4xx) for upgrade instructions