Simplify goals interface, remove .

yahtzee.py

@@ -1,6 +1,6 @@
 from die import Die
 
-class Yachtzee:
+class Yahtzee:
     """A command-line Yahtzee game.
     This version of Yahtzee is initialized with a list of goals.
     """
@@ -11,6 +11,9 @@ class Yachtzee:
 
     def play(self):
         print("Welcome to Yachtzee!")
+        self.score = 0
+        for goal in self.goals:
+            goal.used = False
         while self.count_unused_goals() > 0:
             self.play_round()
         print(f"Your final score was {self.score}")