Upgrade elixir version to 1.7.4 #54

	name: CI

	on: [push, pull_request]

	jobs:
	format:
	name: Format
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v1
	- name: Install OTP and Elixir
	uses: erlef/setup-beam@v1
	with:
	otp-version: 22.1
	elixir-version: 1.8.2
	- name: Install dependencies
	run: mix deps.get --only test
	- name: Check mix format
	run: mix format --check-formatted

	test:
	name: Test
	runs-on: ubuntu-latest
	services:
	redis:
	image: redis:5.0
	ports:
	- 6379:6379
	options: --entrypoint redis-server
	steps:
	- uses: actions/checkout@v1
	- name: Install OTP and Elixir
	uses: erlef/setup-beam@v1
	with:
	otp-version: 22.1
	elixir-version: 1.8.2
	- name: Install dependencies
	run: \|
	mix deps.get --only test
	mix deps.compile
	- name: Run tests
	run: mix test
	env:
	REDIS_HOST: redis
	REDIS_PORT: ${{ job.services.redis.ports[6379] }}

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