Update actions/checkout action to v4 #198

	name: CI
	on: [push]
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v4
	with:
	go-version: "1.20"
	- name: Test 🧪
	run: go test -v -cover
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	- name: Examine code 🔍
	run: go vet
	- name: Build 🏭
	run: go build main.go

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