CHANGELOG.md in google-cloud-datastore-2.2.0 vs CHANGELOG.md in google-cloud-datastore-2.2.1

@@ -1,6 +1,12 @@
 # Release History
 
+### 2.2.1 / 2021-07-08
+
+#### Documentation
+
+* Update AUTHENTICATION.md in handwritten packages
+
 ### 2.2.0 / 2021-03-10
 
 #### Features
 
 * Drop support for Ruby 2.4 and add support for Ruby 3.0