Update CHANGELOG for Firestore v1.5.0 (#3705)

wilhuff · web-flow · commit 76601bf5e9c1 · 2019-08-27T13:48:27.000-07:00
diff --git a/Firestore/CHANGELOG.md b/Firestore/CHANGELOG.md
@@ -1,4 +1,6 @@
 # Unreleased
+
+# v1.5.0
 - [changed] Transactions now perform exponential backoff before retrying.
   This means transactions on highly contended documents are more likely to
   succeed.
