Add useful repr to all data classes.

discord/game.py

@@ -61,6 +61,9 @@ class Game:
     def __str__(self):
         return self.name
 
+    def __repr__(self):
+        return '<Game name={0.name!r} type={0.type!r} url={0.url!r}>'.format(self)
+
     def _iterator(self):
         for attr in self.__slots__:
             value = getattr(self, attr, None)