Update app.py

app.py

@@ -41,7 +41,7 @@ def get_article():
 
 
 def send_result(l_output, r_output, prompt, pick):
-    with csv.open('results.csv','a') as res_file:
+    with open('results.csv','a') as res_file:
       writer = csv.writer(res_file)
       row = [USER_ID,left,right,prompt,pick]
       writer.writerow(row)