Add "exists" method to Filer #51

	name: hio

	on:
	push:
	branches:
	- 'master'
	pull_request:
	workflow_dispatch:

	jobs:
	test:
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ macos-latest, ubuntu-latest ]
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.10.4
	uses: actions/setup-python@v2
	with:
	python-version: 3.10.4
	- name: Install dependencies
	run: \|
	sudo mkdir -p /usr/local/var/hio/test
	sudo mkdir -p /usr/local/var/hio/logs
	sudo mkdir -p /usr/local/var/hio/wirelogs
	sudo chown -R $USER /usr/local/var/hio
	python -m pip install --upgrade pip
	pip install pytest
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
	- name: Run hio tests
	run: \|
	pytest

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