Merge pull request #243 from nobu/protoize #11

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	36s
test (2.5, macos-latest)	1m 1s
test (2.5, windows-latest)	3m 24s
test (2.6, ubuntu-latest)	40s
test (2.6, macos-latest)	1m 39s
test (2.6, windows-latest)	3m 24s
test (2.7, ubuntu-latest)	34s
test (2.7, macos-latest)	1m 18s
test (2.7, windows-latest)	2m 20s
test (3.0, ubuntu-latest)	21s
test (3.0, macos-latest)	28s
test (3.0, windows-latest)	1m 33s
test (3.1, ubuntu-latest)	18s
test (3.1, macos-latest)	31s
test (3.1, windows-latest)	2m 15s
test (3.2, ubuntu-latest)	33s
test (3.2, macos-latest)	35s
test (3.2, windows-latest)	3m 18s
test (head, ubuntu-latest)	34s
test (head, macos-latest)	41s
test (head, windows-latest)	1m 48s
test (jruby, ubuntu-latest)	5m 32s
test (jruby-head, ubuntu-latest)	6m 50s
test (truffleruby, ubuntu-latest)	3m 19s
test (truffleruby-head, ubuntu-latest)	4m 33s
	48m 7s

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