Issue with libraries with hyphens "-" in the name

I have a project with "cv2" and "scikit-learn" but when i used the command
`pipreqs . --force --mode no-pin`
It was giving the requirements.txt as

> noise
> numpy
> opencv_python
> Pillow
> scikit_learn
> scipy
> skimage
> torch
> torchvision
> tqdm

As you can see the opencv-python is written as opencv_python (which is in correct manner "opencv-python") and more of the bad one is "skimage" which is really "scikit-image".

If I am doing something wrong please guide me.

Start by reproducing `pipreqs . --force --mode no-pin` with imports for `cv2`, `scikit-learn`, and `skimage`, then trace the command's import-to-distribution-name mapping. Done means the generated requirements.txt uses `opencv-python` and `scikit-image` rather than underscore or shortened names.

Written by the indexing model from the issue text.