Update README.md #341

	name: Elixir CI

	on: [push, pull_request]

	jobs:

	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	elixir_version: ['1.11.4', '1.12.3', '1.13.4']
	otp_version: ['23.3', '24.3']

	steps:
	- uses: actions/checkout@v2
	- name: Set up Elixir
	uses: erlef/setup-beam@v1
	id: setup-beam
	with:
	elixir-version: ${{ matrix.elixir_version }}
	otp-version: ${{ matrix.otp_version }}


	- name: Restore deps and _build
	uses: actions/cache@v2
	id: deps_and_build_cache
	with:
	path: \|
	deps
	_build
	key: ${{ runner.os }}-mix-${{ matrix.elixir_version }}-${{ matrix.otp_version }}-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}

	- name: Restore PLTs
	uses: actions/cache@v2
	id: plt_cache
	with:
	path: priv/plts
	key: ${{ runner.os }}-dialyzer-${{ matrix.elixir_version }}-${{ matrix.otp_version }}-plt

	- name: Install dependencies
	id: install_deps
	run: mix do deps.get, deps.compile

	- name: Check if formatted
	id: check_format
	# only check if the code has been properly formatted in the agent running the latest Elixir version
	if: ${{ contains(matrix.elixir_version, '1.13') }}
	run: mix format --check-formatted

	- name: Run credo
	id: run_credo
	# only run credo on the latest Elixir
	if: ${{ contains(matrix.elixir_version, '1.13') }}
	run: mix credo --strict

	- name: Run tests
	id: run_tests
	run: mix test

	# Only generate thhe PLTs if no cache was found
	- name: Create PLTs
	id: create_plts
	if: steps.plt_cache.outputs.cache-hit != 'true'
	run: mix dialyzer --plt

	- name: Run dialyzer
	id: run_dialyzer
	run: mix dialyzer

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