Update titfortat.py

Author: souravsingh

axelrod/strategies/titfortat.py

@@ -692,7 +692,7 @@ class EugineNier(Player):
     def strategy(self, opponent: Player) -> Action:
         if not self.history:
             return C
-        if opponent.history[-5] == [D, D, D, D, D]:
+        if opponent.history[-5:] == [D, D, D, D, D]:
             return D
         if opponent.history[-1] == D:
             return D