CHANGELOG.md in google-cloud-datastore-2.2.3 vs CHANGELOG.md in google-cloud-datastore-2.2.4

@@ -1,6 +1,12 @@
 # Release History
 
+### 2.2.4 / 2022-01-11
+
+#### Documentation
+
+* Update contributing docs
+
 ### 2.2.3 / 2021-10-21
 
 #### Documentation
 
 * Add documentation for quota_project Configuration attribute