uncomment string.h include again #126

	name: PlatformIO CI

	on:
	push:
	pull_request:
	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:


	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- 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
	run: \|
	python -m pip install --upgrade pip
	pip install --upgrade platformio
	- name: Run PlatformIO
	run: \|
	cd include
	for h in `ls -1 *.h.sample`; do l=${h%.sample}; ln -s $h $l; done
	cd ..
	ln -s server.crt.sample server.crt
	ln -s server.key.sample server.key
	pio run -e ESP32_TTGO_DISPLAY \
	-e ESP32_TTGO_DISPLAY_SSL \
	-e ESP32_WT32-SC01 \
	-e ESP32_TTGO_T4 \
	-e ESP32_WROOMD_HEADLESS

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