celery.task.group is now an alias to TaskSet

celery/task/__init__.py

@@ -20,7 +20,9 @@ from .chords import chord
 from .control import discard_all
 
 __all__ = ["Task", "TaskSet", "PeriodicTask", "subtask",
-           "discard_all", "chord"]
+           "discard_all", "chord", "group"]
+
+group = TaskSet
 
 
 def task(*args, **kwargs):