Update CHANGELOG for Firestore v1.16.4 (#6206)

wilhuff · web-flow · commit a9f6ec923d9d · 2020-08-04T16:19:18.000-07:00
diff --git a/Firestore/CHANGELOG.md b/Firestore/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Unreleased
 
+# v1.16.4
+- [changed] Rearranged public headers for future Swift Package Manager support.
+  This should have no impact existing users of CocoaPods, Carthage, or zip file
+  distributions.
+
 # v1.16.3
 - [changed] Internal improvements for future C++ and Unity support.
 
