[Feature Request] Add support for type hint syntax

[letientai299]

Please add support for Type Hint (PEP 484) in Python 3.

As of now, pydocstring create the following result.

def foo(n: int ) -> bool:
    """foo

    :param n:int)->bool::
    """
    return True

It would be much better if we could get following result:

def foo(n: int ) -> bool:
    """foo

    :param n (int):

    :return (bool):
    """
    return True
"""

[heavenshell]

@letientai299 Yeah, I will support it. But this is no easy, so stay tuned.

If you don't wait my implementation, patches are welcome 😊

[heavenshell]

Done #15