support coredns v1.11.4 and v1.12.0 #70

	name: Go Tests
	on: [push, pull_request]

	jobs:
	verify-gomod:
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go
	uses: actions/setup-go@v2
	with:
	go-version: 1.15
	stable: true

	- name: Check code
	uses: actions/checkout@v2

	- run: go mod tidy

	- name: Verify no changes from go mod tidy.
	run: \|
	if [ -n "$(git status --porcelain)" ]; then
	git status # These are the files that failed to pass the check.
	exit 1
	fi
	tests:
	runs-on: ubuntu-latest
	steps:
	- name: Install Go
	uses: actions/setup-go@v2
	with:
	go-version: 1.15
	stable: true

	- name: Check out code
	uses: actions/checkout@v2

	- name: Test
	run: \|
	make test

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