Update app.py

app.py

@@ -72,7 +72,7 @@ def add_certified_user(hf_username, pass_percentage, submission_time):
   """
   print("ADD CERTIFIED USER")
   repo.git_pull()
-  history = pd.read_csv(CERTIFIED_USERS_FILENAME)
+  history = pd.read_csv(os.path.join(CERTIFIED_USERS_DIR, CERTIFIED_USERS_FILENAME))
 
   # Check if this hf_username is already in our dataset:
   check = history.loc[history['hf_username'] == hf_username]