update: fix page number and refers original sample code #281

	name: Go

	on:
	push:
	branches:
	- v2
	pull_request:
	types: [opened, synchronize]
	paths:
	- '**.go'
	- 'go.mod'

	jobs:
	test:
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	runs-on: ${{ matrix.os }}

	steps:
	- name: Check out code into the Go module directory
	uses: actions/checkout@v4

	- name: Set up Go 1.x
	uses: actions/setup-go@v5
	with:
	go-version-file: 'go.mod'
	cache: true

	- name: Set up Graphviz
	uses: ts-graphviz/setup-graphviz@v2

	- name: Build
	run: go build -v ./...

	- name: Test
	run: \|
	go test -v ./...
	cd tokenizer; go test -benchmem -bench .; cd ..

	coverage:
	needs: test
	runs-on: ubuntu-latest
	steps:
	- name: Check out code into the Go module directory
	uses: actions/checkout@v4
	- name: Set up Go 1.x
	uses: actions/setup-go@v5
	with:
	go-version-file: 'go.mod'
	cache: true
	- name: Install goveralls
	run: go install github.com/mattn/goveralls@latest
	- name: Coverage
	run: \|
	go test -v -coverprofile=profile.cov -covermode=atomic ./...
	goveralls -coverprofile=profile.cov -service=github
	env:
	COVERALLS_TOKEN: ${{ github.token }}

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