Prepare release (#1110)

* Prepare release

* Apply suggestions from code review

Co-authored-by: Tobias Nyholm <[email protected]>

* Fix changelogs

Co-authored-by: Tobias Nyholm <[email protected]>

Author: jderusse

CHANGELOG.md

@@ -2,10 +2,14 @@
 
 ## NOT RELEASED
 
+## 1.12.0
+
 ### Added
 
 - Support for Firehose
 - Support for ElastiCache
+- Support for CloudWatchClient
+- Support for psr/log 2.0 and 3.0
 
 ## 1.11.0