build

Show build badge of master branch in README (#367) #349

Job	Run time
test (ubuntu-latest, 28.2, false)	53s
test (ubuntu-latest, 29.3, false)	1m 10s
test (macos-latest, 28.2, false)	1m 29s
test (macos-latest, 29.3, false)	2m 21s
test (windows-latest, 28.2, false)	3m 14s
test (windows-latest, 29.3, false)	6m 2s
test (ubuntu-latest, 27.2, false)	43s
test (windows-latest, 27.2, false)	4m 16s
test (ubuntu-latest, snapshot, true)	39s
test (macos-latest, snapshot, true)	1m 26s
test (windows-latest, snapshot, true)	8m 39s
	30m 52s

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