Merge pull request #253 from yui-knk/add_dependency #38

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.5, ubuntu-latest)	34s
test (2.5, macos-latest)	59s
test (2.5, windows-latest)	2m 52s
test (2.6, ubuntu-latest)	37s
test (2.6, macos-latest)	1m 11s
test (2.6, windows-latest)	3m 40s
test (2.7, ubuntu-latest)	31s
test (2.7, macos-latest)	1m 1s
test (2.7, windows-latest)	2m 20s
test (3.0, ubuntu-latest)	27s
test (3.0, macos-latest)	25s
test (3.0, windows-latest)	1m 17s
test (3.1, ubuntu-latest)	27s
test (3.1, macos-latest)	31s
test (3.1, windows-latest)	1m 38s
test (3.2, ubuntu-latest)	27s
test (3.2, macos-latest)	52s
test (3.2, windows-latest)	3m 0s
test (head, ubuntu-latest)	28s
test (head, macos-latest)	43s
test (head, windows-latest)	1m 37s
test (jruby, ubuntu-latest)	6m 50s
test (jruby-head, ubuntu-latest)	8m 4s
test (truffleruby, ubuntu-latest)	2m 36s
test (truffleruby-head, ubuntu-latest)	2m 46s
	45m 56s

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