Update Readme - OpenCV 3.0 or 2.4.13

Alexey

2017-08-02 e29ccc66b649f7fae75d2809b77d7b15141d1163

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classes= 20
train  = /home/pjreddie/data/voc/train.txt
valid  = /home/pjreddie/data/voc/2007_test.txt
names = data/voc.names
backup = /home/pjreddie/backup/