Update app.py

app.py

@@ -77,7 +77,7 @@ def bot(
         response.resolve()
     else:
         image_prompt = preprocess_image(image_prompt)
-        model = genai.GenerativeModel('gemini-pro-vision')
+        model = genai.GenerativeModel(model_name)
         response = model.generate_content(
             contents=[text_prompt, image_prompt],
             stream=True,