Merge pull request #239 from yui-knk/v1.7.2 #13

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	34s
test (2.5, macos-latest)	1m 16s
test (2.5, windows-latest)	3m 14s
test (2.6, ubuntu-latest)	44s
test (2.6, macos-latest)	1m 2s
test (2.6, windows-latest)	2m 56s
test (2.7, ubuntu-latest)	41s
test (2.7, macos-latest)	1m 38s
test (2.7, windows-latest)	2m 31s
test (3.0, ubuntu-latest)	20s
test (3.0, macos-latest)	33s
test (3.0, windows-latest)	2m 25s
test (3.1, ubuntu-latest)	18s
test (3.1, macos-latest)	25s
test (3.1, windows-latest)	2m 35s
test (3.2, ubuntu-latest)	31s
test (3.2, macos-latest)	37s
test (3.2, windows-latest)	1m 53s
test (head, ubuntu-latest)	33s
test (head, macos-latest)	59s
test (head, windows-latest)	2m 22s
test (jruby, ubuntu-latest)	6m 43s
test (jruby-head, ubuntu-latest)	5m 45s
test (truffleruby, ubuntu-latest)	2m 18s
test (truffleruby-head, ubuntu-latest)	2m 55s
	45m 50s

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