updated changelog to address PR feedback

com.unity.perception/Tests/Runtime/Randomization/ScenarioTests/Resources/SampleScenarioConfiguration.json

     "randomSeed": 539662031
   },
   "randomizers": {
-    "groups": {
-      "RotationRandomizer": {
+    "groups": [
+      {
+        "className": "RotationRandomizer",
         "metadata": {
           "name": "",
           "description": "",
           }
         }
       }
-    }
+    ]
   }
 }

com.unity.perception/Runtime/Randomization/Scenarios/Serialization/ScenarioSerializer.cs

             };
         }
 
-        static Dictionary<string, Group> SerializeRandomizers(IEnumerable<Randomizer> randomizers)
+        static List<Group> SerializeRandomizers(IEnumerable<Randomizer> randomizers)
-            var serializedRandomizers = new Dictionary<string, Group>();
+            var serializedRandomizers = new List<Group>();
-                serializedRandomizers.Add(randomizer.GetType().Name, randomizerData);
+
+                serializedRandomizers.Add(randomizerData);
             }
             return serializedRandomizers;
         }
             var randomizerData = new Group();
             var fields = randomizer.GetType().GetFields();
+            randomizerData.className = randomizer.GetType().Name;
             foreach (var field in fields)
             {
                 if (field.FieldType.IsSubclassOf(typeof(Randomization.Parameters.Parameter)))
             DeserializeRandomizers(scenario.randomizers, template.groups);
         }
 
-        static void DeserializeRandomizers(IEnumerable<Randomizer> randomizers, Dictionary<string, Group> groups)
+        static void DeserializeRandomizers(IEnumerable<Randomizer> randomizers, List<Group> groups)
-            foreach (var randomizerPair in groups)
+            foreach (var randomizerData in groups)
-                if (!randomizerTypeMap.ContainsKey(randomizerPair.Key))
+                if (!randomizerTypeMap.ContainsKey(randomizerData.className))
-                var randomizer = randomizerTypeMap[randomizerPair.Key];
-                DeserializeRandomizer(randomizer, randomizerPair.Value);
+                var randomizer = randomizerTypeMap[randomizerData.className];
+                DeserializeRandomizer(randomizer, randomizerData);
             }
         }
 

com.unity.perception/Runtime/Randomization/Scenarios/Serialization/SerializationStructures.cs

     #region GroupedObjects
     class TemplateConfigurationOptions
     {
-        public Dictionary<string, Group> groups = new Dictionary<string, Group>();
+        public List<Group> groups = new List<Group>();
     }
 
     class StandardMetadata
 
     class Group
     {
+        public string className;
         public StandardMetadata metadata = new StandardMetadata();
         [JsonConverter(typeof(GroupItemsConverter))]
         public Dictionary<string, IGroupItem> items = new Dictionary<string, IGroupItem>();

com.unity.perception/CHANGELOG.md

 
 ### Changed
 
-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".
+ 
+Changed the JSON serialization of Randomizers in a scenario to an array of groups rather than a dictionary.
 
 ### Deprecated