Continuous integration

`package-lock.json` set as CI cache dependency path #10

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Run time

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Job	Run time
Test (18.20.x, macos-latest)	1m 8s
Test (18.20.x, ubuntu-latest)	50s
Test (18.20.x, windows-latest)	1m 30s
Test (20.17.x, macos-latest)	54s
Test (20.17.x, ubuntu-latest)	49s
Test (20.17.x, windows-latest)	1m 44s
	6m 55s