Update changelog for 17.1.2 release (#77)

rsgowman · web-flow · commit 24ae317d6c74 · 2018-10-16T17:32:24.000-04:00
diff --git a/firebase-firestore/CHANGELOG.md b/firebase-firestore/CHANGELOG.md
@@ -1,4 +1,6 @@
 # Unreleased
+
+# 17.1.2
 - [changed] Changed the internal handling for locally updated documents that
   haven't yet been read back from Cloud Firestore. This can lead to slight
   behavior changes and may affect the `SnapshotMetadata.hasPendingWrites()`
