fix Python render method with positional arguments instead of keyword arguments

Author: amirhosseinghanipour

python/openai_harmony/__init__.py

@@ -514,7 +514,7 @@ def render(
             }
 
         return self._inner.render(
-            message_json=message.to_json(), render_options=render_options_dict
+            message.to_json(), render_options_dict
         )
 
     # -- Parsing -------------------------------------------------------