Support for PEP 484

[lunaluxie]

Implementing PEP 484 would let the extension parse function-annotations to automatically fill in types.

For example, the generated doc-string for this annotated function is currently:

def foo(bar: str) -> str:
	"""[summary]
	
	Arguments:
		bar: str {[type]} -- [description]
	
	Returns:
		[type] -- [description]
	"""

	return bar

When it could have generated:

def foo(bar: str) -> str:
	"""[summary]
	
	Arguments:
		bar {str} -- [description]
	
	Returns:
		str -- [description]
	"""

	return bar

[NilsJPWerner]

This is now implemented. Sorry for the delay! :)