Merge branch 'master' into docstring-fix

Author: jerrypeng7773

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Changelog
 
+## v2.91.0 (2022-05-19)
+
+### Features
+
+ * Support Properties for StepCollection
+
+### Bug Fixes and Other Changes
+
+ * Prevent passing PipelineVariable object into image_uris.retrieve
+ * support image_uri being property ref for model
+ * ResourceConflictException from AWS Lambda on pipeline upsert
+
+### Documentation Changes
+
+ * release notes for SMDDP 1.4.1 and SMDMP 1.9.0
+
 ## v2.90.0 (2022-05-16)
 
 ### Features

VERSION

@@ -1 +1 @@
-2.90.1.dev0
+2.91.1.dev0