Fix #180

Changes to be committed:
	modified:   api/views.py

Author: HadleyKing

api/views.py

@@ -654,7 +654,6 @@ class ApiObjectsDraftsModify(APIView):
             ),
             "contents": openapi.Schema(
                 type=openapi.TYPE_OBJECT,
-                additional_properties=True,
                 description="Contents of the BCO.",
             ),
         },