Update app.py

app.py

@@ -33,7 +33,7 @@ def create_newsletter(contents):
     response = openai.chat.completions.create(
         model="gpt-4o-mini",
         messages=[
-            {"role": "system", "content": "You are a helpful assistant and en expert in making Newsletters for the Electric Vehicle Community AmpSphere."},
+            {"role": "system", "content": "You are a helpful assistant and en expert in making Substack Newsletters for the Electric Vehicle Community AmpSphere."},
             {"role": "user", "content": prompt}
         ]
     )