bump required go version to 1.18 #291

	name: golangci-lint
	on: [push ]
	jobs:
	golangci:
	name: lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: golangci-lint
	uses: golangci/golangci-lint-action@v2
	with:
	# Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
	version: latest

	# Optional: working directory, useful for monorepos
	# working-directory: somedir
	output: checkstyle
	print-issued-lines: true
	format: colored-line-number
	print-linter-name: true
	sort-results: true

	# Optional: golangci-lint command line arguments.
	# args: --issues-exit-code=0
	# args: --out-format checkstyle

	# Optional: show only new issues if it's a pull request. The default value is `false`.
	# only-new-issues: true

	# Optional: if set to true then the action will use pre-installed Go.
	# skip-go-installation: true

	# Optional: if set to true then the action don't cache or restore ~/go/pkg.
	# skip-pkg-cache: true

	# Optional: if set to true then the action don't cache or restore ~/.cache/go-build.
	# skip-build-cache: true

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