Add required python packages to building docs

Build fails almost silently without them.
Syncs with instructions at https://learn.adafruit.com/building-circuitpython/build-circuitpython
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Raphaël Doursenaud 2021-09-08 23:48:50 +02:00 committed by GitHub
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@ -28,6 +28,12 @@ This project has a bunch of git submodules. You will need to update them regula
git submodule sync
git submodule update --init
### Required Python Packages
Failing to install these will prevent from properly building.
pip3 install -r requirements-dev.txt
### mpy-cross
As part of the build process, mpy-cross is needed to compile .py files into .mpy files.