support new go.mod #808

	name: style-check
	on:
	# Trigger the workflow on push or pull request,
	# but only for the master branch
	push:
	paths-ignore:
	- '**.md'
	- '**.png'
	pull_request:
	paths-ignore:
	- '**.md'
	- '**.png'
	jobs:
	run:
	name: vet and gofmt
	strategy:
	matrix:
	go-version: [1.16.x]
	runs-on: ubuntu-latest
	steps:
	- name: Install Go
	uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go-version }}
	# This step checks out a copy of your repository.
	- name: Checkout code
	uses: actions/checkout@v2
	- name: Go vet check
	run: \|
	go vet ./...
	- name: Gofmt check
	run: \|
	diff=`find . -name "*.go" \| xargs gofmt -s -d`
	if [[ -n "${diff}" ]]; then
	echo "Gofmt check failed :"
	echo "${diff}"
	echo "Please run this command to fix: [find . -name "*.go" \| xargs gofmt -s -w]"
	exit 1
	fi

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