Add Syncer interface. #18

	name: test

	on: [push]
	jobs:

	build:
	name: Build
	runs-on: ubuntu-20.04
	steps:

	- name: Set up Go 1.22
	uses: actions/setup-go@v2
	with:
	go-version: 1.22
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v2

	- name: Get dependencies
	run: \|
	go get -v -t -d ./...

	- name: Test
	run: go test -v .

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