Update app.py

app.py

@@ -12,6 +12,7 @@ model_option = ['deepseek-ai/deepseek-coder-1.3b-instruct',
              'microsoft/phi-2', 
              'mistralai/Mistral-7B-Instruct-v0.2',
              'codellama/CodeLlama-7b-hf',
+             'gpt2'
              'enter by myself']
 
 input_option = ['123.5', 'hello world!!!', '大雨＋寒流來襲！全台極凍72小時「探5度以下」',