Update datetime.md

docs/modules/datetime.md

@@ -78,4 +78,7 @@ class timedelta:
     def __le__(self, other: 'timedelta') -> bool: ...
     def __gt__(self, other: 'timedelta') -> bool: ...
     def __ge__(self, other: 'timedelta') -> bool: ...
+
+class timezone:
+    def __init__(self, delta: timedelta): ...
 ```