Update utils.py

utils.py

@@ -24,7 +24,7 @@ def update_model_stats(model1_name, model2_name, winner, turn, anony, language):
         "tstamp": tstamp
     })
 
-def calculate_elo(winner_elo, loser_elo, k=30, outcome=1):
+def calculate_elo(winner_elo, loser_elo, k=28, outcome=1):
     """
     winner_elo: Elo score of the winner before the game
     loser_elo: Elo score of the loser before the game