Update pre_bootloader_serial.py for RPi 5 architecture #252

	name: PlatformIO Build Test

	on: [push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	with:
	submodules: recursive
	- name: Set up Python
	uses: actions/setup-python@v1
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -U pyyaml
	python -m pip install -U platformio
	platformio update
	- name: PlatformIO build test
	run: \|
	platformio run

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