README update #42

	name: Platform IO CI
	on: [push]
	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	strategy:
	matrix:
	pio-env: ["esp12e", "esp32dev"]
	# strategy:
	# matrix:
	# example: [examples/basic.ino]
	steps:
	- uses: actions/checkout@v2
	- name: Set up python
	uses: actions/setup-python@v2
	with:
	python-version: '3.x'
	architecture: 'x64'
	- name: Install PlatformIO
	run: python -m pip install platformio
	- name: Build firmware
	run: pio ci --lib="." --board ${{matrix.pio-env}} "examples/basic.ino"

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