README: major rewrite, with embedded example #18

	name: Go
	on: [push]
	jobs:

	build:
	name: Build&test
	runs-on: ubuntu-latest

	env:
	GO111MODULE: 'on'
	strategy:
	matrix:
	go:
	- 'stable'
	- 'oldstable'
	- '1.20'
	- '1.19'
	- '1.18'
	- '1.17'
	- '1.16'
	- '1.15'
	- '1.14'
	- '1.13'
	- '1.12'

	steps:
	- name: Check out code
	uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: ${{ matrix.go }}
	id: go

	- name: Build
	run: go build -v .

	- name: Test
	run: go test -v -covermode=atomic -coverprofile=coverage.out ./...

	- name: Upload coverage to Codecov.io
	# https://github.com/codecov/codecov-action
	# https://docs.codecov.com/docs/quick-start
	uses: codecov/codecov-action@v4
	with:
	# https://github.com/dolmen-go/codegen/settings/secrets/actions
	token: ${{ secrets.CODECOV_TOKEN }}

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