tweaks for server using serialization

dice.py

@@ -1,15 +1,13 @@
 import random as rd
 
 class Dice():
-    def __init__(self):
-        raise TypeError("Un dé ne peut pas être instanciée!")
-    
-    @staticmethod
-    def roll(self, num_faces=20):
-        return rd.randrange(start=1, stop=num_faces+1, step=1)
+    def __init__(self, num_faces:int=20):
+        self.num_faces = num_faces
 
-    @staticmethod
-    def head_or_tails():
+    def roll(self):
+        return rd.randrange(start=1, stop=self.num_faces+1, step=1)
+
+    def head_or_tails(self):
         result = rd.randint(0,1)
         if result: # true
             return "head" # face