Merge pull request #234 from yui-knk/fix_typo #379

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.5, ubuntu-latest)	37s
test (2.5, macos-latest)	1m 26s
test (2.5, windows-latest)	3m 13s
test (2.6, ubuntu-latest)	39s
test (2.6, macos-latest)	1m 11s
test (2.6, windows-latest)	3m 8s
test (2.7, ubuntu-latest)	36s
test (2.7, macos-latest)	1m 3s
test (2.7, windows-latest)	2m 36s
test (3.0, ubuntu-latest)	22s
test (3.0, macos-latest)	35s
test (3.0, windows-latest)	1m 41s
test (3.1, ubuntu-latest)	21s
test (3.1, macos-latest)	43s
test (3.1, windows-latest)	1m 58s
test (3.2, ubuntu-latest)	29s
test (3.2, macos-latest)	3m 13s
test (3.2, windows-latest)	3m 7s
test (head, ubuntu-latest)	32s
test (head, macos-latest)	49s
test (head, windows-latest)	2m 20s
test (jruby, ubuntu-latest)	5m 43s
test (jruby-head, ubuntu-latest)	5m 48s
test (truffleruby, ubuntu-latest)	2m 18s
test (truffleruby-head, ubuntu-latest)	3m 21s
	47m 53s

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