CHANGELOG.md in google-cloud-pubsub-1.8.0 vs CHANGELOG.md in google-cloud-pubsub-1.9.0

@@ -1,6 +1,12 @@
 # Release History
 
+### 1.9.0 / 2020-07-21
+
+#### Features
+
+* Add support for server-side flow control
+
 ### 1.8.0 / 2020-06-29
 
 #### Features
 
 * Add Subscription#filter