Inconsistent arguments for `perform()`

[jenstroeger]

Just an observation: the GenericActor class calls the perfom() function like so

dramatiq/dramatiq/generic.py

Lines 105 to 106 in aa91cdf

	def __call__(self, *args, **kwargs):
	return self.perform(*args, **kwargs)

but doesn’t actually declare those arguments here

dramatiq/dramatiq/generic.py

Lines 108 to 113 in aa91cdf

	def perform(self):
	"""This is the method that gets called when the actor receives
	a message. All non-abstract subclasses must implement this
	method.
	"""
	raise NotImplementedError("%s does not implement perform()" % self.__name__)

I’m not sure if the generic module is used or maintained much, but I think that’s an inconsistency that ought to be addressed.

Happy to provide a PR and add the args into the function.

[LincolnPuzey]

I would be concerned that adding *args, **kwargs to the base class perform would introduce typing errors in subclasses that only define a fixed set of arguments