Update actions/checkout action to v4 #59

	on:
	pull_request:
	paths-ignore:
	- "README.md"

	jobs:
	build:
	runs-on: ubuntu-latest
	timeout-minutes: 5
	steps:
	- name: Set up Go
	uses: actions/setup-go@v3.5.0
	with:
	go-version: "1.18"
	- name: Check out code into the Go module directory
	uses: actions/checkout@v4.1.6
	- name: Build
	run: \|
	go build -v .

	test:
	needs: build
	runs-on: ubuntu-latest
	timeout-minutes: 15
	steps:
	- name: Set up Go
	uses: actions/setup-go@v3.5.0
	with:
	go-version: "1.18"
	- name: Check out code into the Go module directory
	uses: actions/checkout@v4.1.6
	- name: Unit testing
	run: \|
	go test -v -cover .

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