Minor README updates #134

	name: PlatformIO CI

	on:
	push:
	paths:
	- 'firmware/**'
	- 'proto/**'
	- 'thirdparty/nanopb/**'
	- 'platformio.ini'
	- '.github/workflows/pio.yml'
	pull_request:
	paths:
	- 'firmware/**'
	- 'proto/**'
	- 'thirdparty/nanopb/**'
	- 'platformio.ini'
	- '.github/workflows/pio.yml'

	jobs:
	pio-build:
	runs-on: ubuntu-20.04

	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Cache pip
	uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
	restore-keys: \|
	${{ runner.os }}-pip-

	- name: Cache PlatformIO
	uses: actions/cache@v2
	with:
	path: ~/.platformio
	key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}

	- name: Set up Python
	uses: actions/setup-python@v2

	- name: Install PlatformIO
	id: pio_install
	run: \|
	python -m pip install --upgrade pip
	pip install --upgrade platformio

	- name: Build Firmware (view)
	# Run regardless of other build step failures, as long as setup steps completed
	if: always() && steps.pio_install.outcome == 'success'
	run: \|
	pio run \
	-e view

	- name: Build Firmware (nanofoc)
	# Run regardless of other build step failures, as long as setup steps completed
	if: always() && steps.pio_install.outcome == 'success'
	run: \|
	pio run \
	-e nanofoc

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