Task decorator removes docstring

[kasium]

When using @task, the decorated function loses it's docstring, because internally a functools.wraps is missing here

invoke/invoke/tasks.py

Lines 353 to 358 in edbb0b1

	kwargs["pre"] = args
	def inner(body: Callable) -> Task[T]:
	_task = klass(body, **kwargs)
	return _task

Easy to fix:

@wraps(body)
 def inner(body: Callable) -> Task[T]: 
     _task = klass(body, **kwargs) 
     return _task 

[pyhedgehog]

Dupe of #555