Add tests for yarn and pnpm (#117) #1

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Job	Run time
test (ubuntu-latest, lts/*, npm)	1m 54s
test (ubuntu-latest, lts/*, pnpm)	1m 54s
test (ubuntu-latest, lts/*, yarn)	1m 56s
test (ubuntu-latest, 18, npm)	1m 55s
test (ubuntu-latest, 18, pnpm)	1m 56s
test (ubuntu-latest, 18, yarn)	1m 56s
test (windows-latest, lts/*, npm)	1m 40s
test (windows-latest, lts/*, pnpm)	1m 42s
test (windows-latest, lts/*, yarn)	40s
test (windows-latest, 18, npm)	1m 42s
test (windows-latest, 18, pnpm)	1m 43s
test (windows-latest, 18, yarn)	1m 39s
test (macos-latest, lts/*, npm)	1m 51s
test (macos-latest, lts/*, pnpm)	1m 52s
test (macos-latest, lts/*, yarn)	1s
test (macos-latest, 18, npm)	1m 52s
test (macos-latest, 18, pnpm)	1m 54s
test (macos-latest, 18, yarn)	1m 38s
automerge	1s
	29m 46s