Actually, we don't even [declare support for 3.8](https://github.com/googleapis/python-api-core/blob/cbf14b314bee8652c6523845116125db232bd0e5/setup.py#L87-L94), although we [test it!](https://github.com/googleapis/python-api-core/blob/cbf14b314bee8652c6523845116125db232bd0e5/noxfile.py#L75)
