Merge pull request #587 from y-yagi/add_logger_as_dependency #271

Job	Run time
linting	16s
test (ubuntu, 2.7, false)	4m 29s
test (ubuntu, 3.0, false)	4m 22s
test (ubuntu, 3.1, false)	4m 15s
test (ubuntu, 3.2, false)	4m 18s
test (ubuntu, 3.3, false)	4m 15s
test (macos, 2.7, false)	4m 35s
test (macos, 3.0, false)	4m 15s
test (macos, 3.1, false)	4m 15s
test (macos, 3.2, false)	4m 18s
test (macos, 3.3, false)	4m 32s
test (macos, truffleruby-head, true)	5m 25s
test (ubuntu, truffleruby-head, true)	4m 40s
test (ubuntu, jruby, true)	4m 48s
test (ubuntu, head, true)	4m 16s
	1h 2m 59s

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