updated CHANGELOG and package.json

com.unity.perception/CHANGELOG.md

 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## [0.9.0-preview.1] - 2021-10-25
+Scenario JSON configurations that were generated using previous versions will need to be manually updated due to updates to serialization and deserialization of scenarios.
+
-Added new configuration options to the Scenario JSON configuration. These include a `limits` block on numerical Scalars and Samplers to denote a valid range, and a `state` block on the Randomizers for enabling/disabling them from the config.
+Added support for multiple cameras capturing simultaneously (visualization not yet supported)
-The user can now choose the base folder location to store their generated datasets.
-
-Added the AssetSource class for loading assets from generic sources inside randomizers.
+Users can now delay the current iteration for one frame from within randomizers by calling the `DelayIteration` function of the active scenario.
-Added a `projection` field in the capture.sensor metadata. Values are either "perspective" or "orthographic".
+Added new configuration options to the Scenario JSON configuration. These include a `limits` block on numerical Scalars and Samplers to denote a valid range, and a `state` block on the Randomizers for enabling/disabling them from the config.
-Users can now delay the current iteration for one frame from within randomizers by calling the `DelayIteration` function of the active scenario.
+Added the AssetSource class for loading assets from generic sources inside randomizers.
-Added support for multiple cameras capturing simultaneously (visualization not yet supported)
+Added a `projection` field in the capture.sensor metadata. Values are either "perspective" or "orthographic".
-Changed the JSON serialization key of Normal Sampler's standard deviation property from "standardDeviation" to "stddev". Scneario JSON configurations that were generated using previous versions will need to be manually updated to reflect this change.
+Changed the JSON serialization key of Normal Sampler's standard deviation property from "standardDeviation" to "stddev".
 
 ### Deprecated
 

com.unity.perception/package.json

   "displayName": "Perception",
   "name": "com.unity.perception",
   "unity": "2020.3",
-  "version": "0.8.0-preview.4",
+  "version": "0.9.0-preview.1",
   "samples": [
     {
       "displayName": "Tutorial Files",