Update app.py

app.py

@@ -5,7 +5,8 @@ def display_survey(survey_id):
     base_url = "https://app.surveystack.io/api/submissions"
     params = {'survey': survey_id}
     query_string = urllib.parse.urlencode(params)
-    survey_url = "{}{}".format(base_url, query_string)
+    
+    survey_url = "{}{}{}".format(base_url, "?", query_string)
 
     print(survey_url)