idtrackerai on conda-forge

It would be great if, in addition to PyPi, we could have idtrackerai on conda-forge. To do so, you can use grayskull to generate a recipe and follow the instructions on conda-forge/staged-recipes: https://github.com/conda-forge/staged-recipes. One potential snag is that the dependency opencv-python-headless isn't on conda-forge, but opencv-python is, so maybe it'll be fine...