Pro-Changes.md in sidekiq-5.2.1 vs Pro-Changes.md in sidekiq-5.2.2

@@ -2,10 +2,16 @@
 
 [Sidekiq Changes](https://github.com/mperham/sidekiq/blob/master/Changes.md) | [Sidekiq Pro Changes](https://github.com/mperham/sidekiq/blob/master/Pro-Changes.md) | [Sidekiq Enterprise Changes](https://github.com/mperham/sidekiq/blob/master/Ent-Changes.md)
 
 Please see [http://sidekiq.org/](http://sidekiq.org/) for more details and how to buy.
 
+4.0.4
+---------
+
+- Update Sidekiq::Client patches to work with new Module#prepend
+  mechanism in Sidekiq 5.2.0. [#3930]
+
 4.0.3
 ---------
 
 - Add at\_exit handler to push any saved jobs in `reliable_push` when exiting. [#3823]
 - Implement batch death callback.  This is fired the first time a job within a batch dies. [#3841]
@@ -24,9 +30,10 @@
 
 4.0.1
 ---------
 
 - Fix incompatibility with the statsd-ruby gem [#3740]
+- Add tags to Statsd metrics when using Datadog [#3744]
 
 4.0.0
 ---------
 
 - See the [Sidekiq Pro 4.0](Pro-4.0-Upgrade.md) release notes.