Fixed ubuntu version for github CI #21

	name: Elixir CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:

	name: Build and test
	runs-on: ubuntu-18.04
	env:
	MIX_ENV: test
	steps:
	- uses: actions/checkout@v2
	- name: Set up Elixir
	uses: actions/setup-elixir@v1
	with:
	elixir-version: '1.11.2' # Define the elixir version [required]
	otp-version: '23' # Define the OTP version [required]
	- name: Restore dependencies cache
	uses: actions/cache@v2
	with:
	path: deps
	key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
	restore-keys: ${{ runner.os }}-mix-
	- name: Install dependencies
	run: \|
	mix deps.get
	mix compile
	- name: Run tests
	run: mix test

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