serializing instanceId in camelCase (#307)

Author: davidmrdavid

azure/durable_functions/models/actions/CallSubOrchestratorAction.py

@@ -36,5 +36,5 @@ def to_json(self) -> Dict[str, Union[str, int]]:
         add_attrib(json_dict, self, 'action_type', 'actionType')
         add_attrib(json_dict, self, 'function_name', 'functionName')
         add_attrib(json_dict, self, '_input', 'input')
-        add_attrib(json_dict, self, 'instance_id', 'instance_id')
+        add_attrib(json_dict, self, 'instance_id', 'instanceId')
         return json_dict

azure/durable_functions/models/actions/CallSubOrchestratorWithRetryAction.py

@@ -40,5 +40,5 @@ def to_json(self) -> Dict[str, Union[str, int]]:
         add_attrib(json_dict, self, 'function_name', 'functionName')
         add_attrib(json_dict, self, '_input', 'input')
         add_json_attrib(json_dict, self, 'retry_options', 'retryOptions')
-        add_attrib(json_dict, self, 'instance_id', 'instance_id')
+        add_attrib(json_dict, self, 'instance_id', 'instanceId')
         return json_dict