only first overloaded signature shown for __init__

[joelberkeley]

Thanks for adding support for overloaded methods as requested in #217 . However I'm not seeing it for all overloads of __init__. Only the first is shown. In my case, I have

class Box:
    @overload
    def __init__(self, lower: List[float], upper: List[float]):
        ...

    @overload
    def __init__(self, lower: tf.Tensor, upper: tf.Tensor):
        ...

    def __init__(self, lower: Union[tf.Tensor, List[float]], upper: Union[tf.Tensor, List[float]]):
        """foobar"""

and I'm seeing

class Box(lower: List[float], upper: List[float])

but no mention of the other variants

this is with sphinx-autoapi==1.5.1