Update README.md

prompt_template_config needs PromptTemplateConfig type but req_settings is PromptExecutionSettings type which seems to be accepted better by prompt_execution_settings

python/README.md

@@ -121,7 +121,7 @@ summarize = kernel.add_function(
     function_name="tldr_function",
     plugin_name="tldr_plugin",
     prompt="{{$input}}\n\nOne line TLDR with the fewest words.",
-    prompt_template_settings=req_settings,
+    prompt_execution_settings=req_settings,
 )
 
 # Summarize the laws of thermodynamics