Merge pull request #254 from yui-knk/v1.7.3 #40

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.5, ubuntu-latest)	37s
test (2.5, macos-latest)	54s
test (2.5, windows-latest)	2m 17s
test (2.6, ubuntu-latest)	41s
test (2.6, macos-latest)	1m 39s
test (2.6, windows-latest)	4m 2s
test (2.7, ubuntu-latest)	35s
test (2.7, macos-latest)	1m 6s
test (2.7, windows-latest)	2m 10s
test (3.0, ubuntu-latest)	20s
test (3.0, macos-latest)	26s
test (3.0, windows-latest)	1m 45s
test (3.1, ubuntu-latest)	19s
test (3.1, macos-latest)	24s
test (3.1, windows-latest)	1m 45s
test (3.2, ubuntu-latest)	33s
test (3.2, macos-latest)	33s
test (3.2, windows-latest)	2m 18s
test (head, ubuntu-latest)	36s
test (head, macos-latest)	44s
test (head, windows-latest)	1m 52s
test (jruby, ubuntu-latest)	5m 42s
test (jruby-head, ubuntu-latest)	4m 18s
test (truffleruby, ubuntu-latest)	2m 12s
test (truffleruby-head, ubuntu-latest)	2m 47s
	40m 38s

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