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Add `--format github` option #509

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Run time

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Job	Run time
rubocop	23s
test (3.0)	2m 1s
test (3.1)	2m 2s
test (3.2)	1m 59s
test (jruby-9.4)	2m 16s
test (3.3)	2m 7s
	10m 48s