Update macOS instructions to not require python from homebrew #21
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The current instructions are not wrong, but they miss the problem. For some reason pyusb has issues finding libusb on arm64 macs, and a fix was pushed to master but not to the pypy package. While messing around with homebrew "solves" the problem, the correct solution here is to simply install pyusb from source. This allows users to skip installing python from homebrew if they already happen to have it from somewhere else (I use pyenv, for example).
I also added a note on the exact python version where I know this works, because I wouldn't be sure this works on any python3 version.