app: Increase tokens to 512

More diverse and coherent text responses with
increased accuracy.

Signed-off-by: Panchajanya1999 <rsk52959@gmail.com>

app.py

@@ -17,7 +17,7 @@ opai.api_key = os.getenv("OPENAI_API_KEY")
 def chatbot(prompt, temperature = 0.2):
     response = opai.ChatCompletion.create(
         model = "gpt-3.5-turbo",
-        max_tokens = 100,
+        max_tokens = 512,
         temperature = temperature,
         frequency_penalty = 0,
         presence_penalty = 0.6,