dev(narugo): fix examples, ci skip

    Examples::

        >>> from imgutils.detect import detect_halfbody, detection_visualize

        >>>

        >>> image = 'nude_girl.png'

        >>> image = 'squat.jpg'

        >>> result = detect_halfbody(image)  # detect it

        >>> result

        [

            ((365, 264, 399, 289), 'nipple_f', 0.7473511695861816),

            ((224, 260, 252, 285), 'nipple_f', 0.6830288171768188),

            ((206, 523, 240, 608), 'pussy', 0.6799028515815735)

        ]

        [((127, 21, 629, 637), 'halfbody', 0.9040350914001465)]

        >>>

        >>> # visualize it

        >>> from matplotlib import pyplot as plt