__annotations__ should be included in the set of attributes copied by default to a wrapped method.

An example of the problem:
>>> from functools import wraps
>>> def mydecorator(fn):
...     @wraps(fn)
...     def inner(*args, **kwargs):
...         return fn(*args, **kwargs)
...     return inner
...
>>> @mydecorator
... def foo(a:int, b:str):
...     pass
... 
>>> foo.__annotations__
{}

With the included fix:
>>> foo.__annotations__
{'a': <class 'int'>, 'b': <class 'str'>}