Merge pull request #254 from yui-knk/v1.7.3 #41

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	26s
test (2.5, macos-latest)	1m 29s
test (2.5, windows-latest)	2m 30s
test (2.6, ubuntu-latest)	45s
test (2.6, macos-latest)	1m 51s
test (2.6, windows-latest)	2m 35s
test (2.7, ubuntu-latest)	36s
test (2.7, macos-latest)	1m 30s
test (2.7, windows-latest)	2m 50s
test (3.0, ubuntu-latest)	21s
test (3.0, macos-latest)	32s
test (3.0, windows-latest)	1m 11s
test (3.1, ubuntu-latest)	16s
test (3.1, macos-latest)	27s
test (3.1, windows-latest)	1m 6s
test (3.2, ubuntu-latest)	27s
test (3.2, macos-latest)	53s
test (3.2, windows-latest)	2m 4s
test (head, ubuntu-latest)	23s
test (head, macos-latest)	56s
test (head, windows-latest)	1m 55s
test (jruby, ubuntu-latest)	6m 2s
test (jruby-head, ubuntu-latest)	4m 21s
test (truffleruby, ubuntu-latest)	2m 11s
test (truffleruby-head, ubuntu-latest)	2m 47s
	40m 26s

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