Merge pull request #248 from nobu/srcs #28

Job	Run time
ruby-versions / Generate Ruby versions	7s
test (2.5, ubuntu-latest)	40s
test (2.5, macos-latest)	1m 15s
test (2.5, windows-latest)	3m 56s
test (2.6, ubuntu-latest)	27s
test (2.6, macos-latest)	1m 6s
test (2.6, windows-latest)	3m 33s
test (2.7, ubuntu-latest)	30s
test (2.7, macos-latest)	1m 15s
test (2.7, windows-latest)	2m 30s
test (3.0, ubuntu-latest)	25s
test (3.0, macos-latest)	42s
test (3.0, windows-latest)	1m 15s
test (3.1, ubuntu-latest)	25s
test (3.1, macos-latest)	37s
test (3.1, windows-latest)	2m 4s
test (3.2, ubuntu-latest)	32s
test (3.2, macos-latest)	57s
test (3.2, windows-latest)	4m 10s
test (head, ubuntu-latest)	23s
test (head, macos-latest)	55s
test (head, windows-latest)	1m 55s
test (jruby, ubuntu-latest)	7m 14s
test (jruby-head, ubuntu-latest)	5m 43s
test (truffleruby, ubuntu-latest)	3m 1s
test (truffleruby-head, ubuntu-latest)	2m 42s
	48m 19s

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