drop support of Go 1.12 #109

	name: reviewdog
	on: [pull_request]

	jobs:
	golangci-lint:
	name: golangci-lint
	runs-on: ubuntu-latest
	steps:
	- name: Check out code into the Go module directory
	uses: actions/checkout@v2
	- name: golangci-lint
	uses: reviewdog/action-golangci-lint@v1
	with:
	github_token: ${{ secrets.github_token }}
	level: warning

	misspell:
	name: misspell
	runs-on: ubuntu-latest
	steps:
	- name: Check out code into the Go module directory
	uses: actions/checkout@v2
	- name: misspell
	uses: reviewdog/action-misspell@v1
	with:
	github_token: ${{ secrets.github_token }}
	level: warning
	locale: "US"

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