[commands] fix Range to allow 3.10 Union syntax

discord/ext/commands/converter.py

@@ -1096,6 +1096,13 @@ else:
 
             return converted
 
+        def __call__(self) -> None:
+            # Trick to allow it inside typing.Union
+            pass
+
+        def __or__(self, rhs) -> Any:
+            return Union[self, rhs]
+
         def __class_getitem__(cls, obj) -> Range:
             if not isinstance(obj, tuple):
                 raise TypeError(f'expected tuple for arguments, received {obj.__class__!r} instead')