Update app.py

Add model to default

app.py

@@ -9,7 +9,9 @@ st.sidebar.title('Tokenizers demo')
 
 model_option = ['deepseek-ai/deepseek-coder-1.3b-instruct',
              'MediaTek-Research/Breeze-7B-Instruct-64k-v0_1',
-             'microsoft/phi-2', 'enter by myself']
+             'microsoft/phi-2', 
+             'mistralai/Mistral-7B-Instruct-v0.2',
+             '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」',
                 '大雨＋寒流来袭！全台极冻72小时「探5度以下」',