firestore: release v1.1.0

Change-Id: I2e83037806d84b836aa6f8b791ef7844a98874f6
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/48290
Reviewed-by: BenWhitehead <benwhitehead@google.com>
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/firestore/CHANGES.md b/firestore/CHANGES.md
index f141a26..1b8fdc2 100644
--- a/firestore/CHANGES.md
+++ b/firestore/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+## v1.1.0
+
+- Add support for `in` and `array-contains-any` query operators.
+
 ## v1.0.0
 
 This is the first tag to carve out firestore as its own module. See: