Merge pull request #239 from yui-knk/v1.7.2 #12

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	38s
test (2.5, macos-latest)	54s
test (2.5, windows-latest)	3m 15s
test (2.6, ubuntu-latest)	35s
test (2.6, macos-latest)	1m 34s
test (2.6, windows-latest)	3m 25s
test (2.7, ubuntu-latest)	42s
test (2.7, macos-latest)	1m 7s
test (2.7, windows-latest)	2m 14s
test (3.0, ubuntu-latest)	20s
test (3.0, macos-latest)	28s
test (3.0, windows-latest)	1m 0s
test (3.1, ubuntu-latest)	22s
test (3.1, macos-latest)	25s
test (3.1, windows-latest)	1m 54s
test (3.2, ubuntu-latest)	26s
test (3.2, macos-latest)	55s
test (3.2, windows-latest)	3m 44s
test (head, ubuntu-latest)	31s
test (head, macos-latest)	35s
test (head, windows-latest)	1m 51s
test (jruby, ubuntu-latest)	6m 47s
test (jruby-head, ubuntu-latest)	7m 27s
test (truffleruby, ubuntu-latest)	2m 14s
test (truffleruby-head, ubuntu-latest)	3m 11s
	46m 36s

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