Update CHANGELOG for Firestore v1.4.2

wilhuff · wilhuff · commit 246053cb5962 · 2019-07-15T14:23:55.000-07:00
diff --git a/Firestore/CHANGELOG.md b/Firestore/CHANGELOG.md
@@ -1,4 +1,6 @@
 # Unreleased
+
+# 1.4.2
 - [fixed] Fixed an internal assertion that was triggered when an update
    with a `FieldValue.serverTimestamp()` and an update with a
   `FieldValue.increment()` were pending for the same document.
