Update CHANGELOG.md

Author: ramsessanchez

CHANGELOG.md

@@ -11,6 +11,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+## [5.22.0] - 2022-04-28
+
+### Added
+
+### Changed
+
+- Generated v1.0 models and request builders using Typewriter.
+- Removed PlannerContainerType and PlannerPlanContainer models. 
+- Removed RequestSchedule model. 
+- Removed TicketInfo model.
+- Removed UnifiedApprovalStage model. 
+- Removed AccessPackageAssignment models and related requests. 
+- Removed UnifiedRole models and related requests.
+- Changed dependencies of models and requests which relied on removed models and requests.  
+
 ## [5.21.0] - 2022-04-22
 
 ### Added