renamed the class following PEP8

Co-authored-by: Vince Knight <[email protected]>

Author: 2 people

axelrod/strategies/grudger.py

@@ -344,7 +344,7 @@ def strategy(opponent: Player) -> Action:
         return C
 
 
-class CAPRI(Player):
+class Capri(Player):
     """
     CAPRI is a memory-3 strategy proposed in [Murase2020]_. Its behavior is defined by the following five rules.
     C: Cooperate at mutual cooperation.