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Add `--format github` option #510

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Run time

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Job	Run time
rubocop	12s
test (3.0)	1m 59s
test (3.1)	1m 54s
test (3.2)	1m 53s
test (jruby-9.4)	18m 6s
test (3.3)	1m 53s
	25m 57s