Merge pull request #251 from yui-knk/v1.7.3.pre.1 #34

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.5, ubuntu-latest)	33s
test (2.5, macos-latest)	57s
test (2.5, windows-latest)	3m 41s
test (2.6, ubuntu-latest)	29s
test (2.6, macos-latest)	1m 5s
test (2.6, windows-latest)	2m 50s
test (2.7, ubuntu-latest)	29s
test (2.7, macos-latest)	1m 12s
test (2.7, windows-latest)	2m 6s
test (3.0, ubuntu-latest)	22s
test (3.0, macos-latest)	47s
test (3.0, windows-latest)	2m 9s
test (3.1, ubuntu-latest)	20s
test (3.1, macos-latest)	27s
test (3.1, windows-latest)	1m 17s
test (3.2, ubuntu-latest)	24s
test (3.2, macos-latest)	51s
test (3.2, windows-latest)	2m 42s
test (head, ubuntu-latest)	23s
test (head, macos-latest)	35s
test (head, windows-latest)	1m 33s
test (jruby, ubuntu-latest)	6m 12s
test (jruby-head, ubuntu-latest)	4m 20s
test (truffleruby, ubuntu-latest)	3m 10s
test (truffleruby-head, ubuntu-latest)	3m 7s
	42m 4s

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