Merge pull request #80 from genya0407/patch-1 #176

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.5 / ubuntu-latest)	21s
build (2.5 / windows-latest)	5m 34s
build (2.6 / ubuntu-latest)	29s
build (2.6 / macos-latest)	34s
build (2.6 / windows-latest)	2m 51s
build (2.7 / ubuntu-latest)	22s
build (2.7 / macos-latest)	28s
build (2.7 / windows-latest)	4m 30s
build (3.0 / ubuntu-latest)	18s
build (3.0 / macos-latest)	19s
build (3.0 / windows-latest)	2m 45s
build (3.1 / ubuntu-latest)	16s
build (3.1 / macos-latest)	17s
build (3.1 / windows-latest)	2m 38s
build (3.2 / ubuntu-latest)	12s
build (3.2 / macos-latest)	14s
build (3.2 / windows-latest)	3m 36s
build (3.3 / ubuntu-latest)	20s
build (3.3 / macos-latest)	17s
build (3.3 / windows-latest)	5m 31s
build (head / ubuntu-latest)	16s
build (head / macos-latest)	18s
build (truffleruby-head / ubuntu-latest)	37s
build (truffleruby-head / macos-latest)	26s
build (mswin / windows-latest)	2m 23s
build (mingw / windows-latest)	2m 23s
	38m 17s

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