Literal types produce incorrect docstring

[dhalenok]

Describe the bug
Argument which type is defined with typing.Literal produces incorrect docstring.

Versions (please complete the following information):

• autoDocstring Version: v0.5.4
• Operating System: macOS 12.0.1
• Vscode Version: 1.63.2

Original Code (with line to generate on):

from typing import Literal

def foo(bar: Literal["baz"]) -> None:
# generate on this line
    pass

Expected Result:

from typing import Literal


def foo(bar: Literal["baz"]) -> None:
    """[summary]

    Args:
        bar (Literal["baz"]): [description]
    """
    pass

Actual Result:

from typing import Literal


def foo(bar: Literal["baz"]) -> None:
    """[summary]

    Args:
        bar (Literal[): [description]
    """
    pass