Hello.

I notice that pipreq failed to recognize cv2.

First, i tried to figure out the reason, and found that the pypi server have the cv2 package name as opencv-python, not cv2.

and i found the file names mapping, which has the package names to mapping input package name to already defined names.

so i add cv2:opencv-python, and it actually worked.

But I don't know if I can edit it like this and I'd like to ask if it's okay to modify this way. I wish someone could check it out. Thanks.