Update app.py

app.py

@@ -35,6 +35,7 @@ for file in files:
     st.write(file)
 
 with open(DATA_FILE, "a") as csvfile:
+  writer = csv.DictWriter(csvfile, fieldnames=["Sentences"])
   writer.writerow({'Sentences': new_row})
   repo.push_to_hub('adding new line')
   st.write('Succcess')