Update app.py

app.py

@@ -91,7 +91,7 @@ class EnglishTutor:
                 json={
                     "model": "deepseek-chat",
                     "messages": [WELCOME_PROMPT],
-                    "temperature": random.uniform(0.7, 0.9),
+                    "temperature": random.uniform(0.9, 1),
                     "response_format": {"type": "json_object"}
                 }
             )