Merge pull request #223 from nobu/gem-version #334

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	36s
test (2.5, macos-latest)	2m 49s
test (2.5, windows-latest)	5m 30s
test (2.6, ubuntu-latest)	54s
test (2.6, macos-latest)	1m 26s
test (2.6, windows-latest)	3m 22s
test (2.7, ubuntu-latest)	41s
test (2.7, macos-latest)	2m 25s
test (2.7, windows-latest)	2m 49s
test (3.0, ubuntu-latest)	33s
test (3.0, macos-latest)	2m 38s
test (3.0, windows-latest)	1m 59s
test (3.1, ubuntu-latest)	33s
test (3.1, macos-latest)	51s
test (3.1, windows-latest)	2m 16s
test (3.2, ubuntu-latest)	32s
test (3.2, macos-latest)	1m 27s
test (3.2, windows-latest)	4m 3s
test (head, ubuntu-latest)	31s
test (head, macos-latest)	53s
test (head, windows-latest)	2m 6s
test (jruby, ubuntu-latest)	6m 32s
test (jruby-head, ubuntu-latest)	6m 30s
test (truffleruby, ubuntu-latest)	3m 14s
test (truffleruby-head, ubuntu-latest)	3m 23s
	58m 35s

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