Minor fix - what pip-packages are required for Python scripts

AlexeyAB

2018-05-06 c9b8bdee1886df5f83973d91c3597c28f99a9e0c

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./darknet detector demo ./cfg/coco.data ./cfg/yolov2.cfg ./yolov2.weights test50.mp4 -i 0 -thresh 0.25