Merge pull request #247 from nobu/bump #24

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	2m 46s
test (2.5, macos-latest)	3m 10s
test (2.5, windows-latest)	4m 34s
test (2.6, ubuntu-latest)	2m 44s
test (2.6, macos-latest)	3m 31s
test (2.6, windows-latest)	5m 5s
test (2.7, ubuntu-latest)	2m 38s
test (2.7, macos-latest)	3m 23s
test (2.7, windows-latest)	3m 35s
test (3.0, ubuntu-latest)	2m 36s
test (3.0, macos-latest)	2m 39s
test (3.0, windows-latest)	3m 58s
test (3.1, ubuntu-latest)	2m 39s
test (3.1, macos-latest)	2m 43s
test (3.1, windows-latest)	5m 10s
test (3.2, ubuntu-latest)	2m 52s
test (3.2, macos-latest)	2m 43s
test (3.2, windows-latest)	4m 35s
test (head, ubuntu-latest)	2m 42s
test (head, macos-latest)	2m 47s
test (head, windows-latest)	4m 47s
test (jruby, ubuntu-latest)	7m 48s
test (jruby-head, ubuntu-latest)	9m 29s
test (truffleruby, ubuntu-latest)	5m 2s
test (truffleruby-head, ubuntu-latest)	5m 35s
	1h 39m 33s

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