Fixed darknet.py when OpenCV is used (added BGR to RGB conversion)

AlexeyAB

2018-06-19 56bff1dc8cbafd718b5733f22bdb63ab4767703b

 build/darknet/x64/yolo-voc.cfg

@@ -256,3 +256,4 @@
absolute=1
thresh = .6
random=1