Test

build: update Go version to 1.18 and GitHub workflow matrix #143

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Run time

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Job	Run time
lint	2m 26s
Test (1.18.x, ubuntu-latest)	20s
Test (1.18.x, macos-latest)	25s
Test (1.19.x, ubuntu-latest)	20s
Test (1.19.x, macos-latest)	34s
Test (1.20.x, ubuntu-latest)	28s
Test (1.20.x, macos-latest)	22s
Test (1.21.x, ubuntu-latest)	23s
Test (1.21.x, macos-latest)	23s
Test (1.22.x, ubuntu-latest)	39s
Test (1.22.x, macos-latest)	23s
	6m 43s