add source urls for summary

app.py

@@ -74,6 +74,7 @@ def dropdown_trend(year_txt, month_txt, date_txt):
 
 def generate(topic, trends_dic):
     article_urls = fetch_article_urls(trends_dic, topic)
+    article_url_str = "\n- ".join(article_urls)
     article_docs = [extract_article(url) for url in article_urls]
 
     openai.api_key  = os.environ['OPENAI_API_KEY']
@@ -156,7 +157,7 @@ def generate(topic, trends_dic):
 
     res = sequentialChain({"input_documents": article_docs})
 
-    summary = [res['translated_summary']]
+    summary = [res['translated_summary'] + '\n\nSources:\n' + article_url_str]
     generated_res = json.loads(res['output_text'])
     
     tweets = []