Update app.py

app.py

@@ -56,7 +56,7 @@ def create_newsletter(contents, language):
     response = openai.chat.completions.create(
         model="gpt-4o-mini",
         messages=[
-            {"role": "system", "content": "You are a helpful assistant expert in making newsletters."},
+            {"role": "system", "content": "You are a helpful assistant and an expert in making newsletters on AI for The Neural (www.theneural.ai)."},
             {"role": "user", "content": prompt}
         ]
     )