define __new__ instead of __init__

Author: djmitche

taskchampion.pyi

@@ -168,7 +168,7 @@ class Annotation:
     entry: datetime
     description: str
 
-    def __init__(self, entry: datetime, description: str) -> None: ...
+    def __new__(cls, entry: datetime, description: str): ...
 
 @final
 class DependencyMap:
@@ -177,6 +177,6 @@ class DependencyMap:
 
 @final
 class Tag:
-    def __init__(self, tag: str): ...
+    def __new__(cls, tag: str): ...
     def is_synthetic(self) -> bool: ...
     def is_user(self) -> bool: ...