Tests

Tighten-up RuboCop configuration. #11

Job	Run time
test (ubuntu, 2.4)	29s
test (ubuntu, 2.5)	26s
test (ubuntu, 2.6)	28s
test (ubuntu, 2.7)	27s
test (ubuntu, 3.0)	13s
test (ubuntu, 3.1)	13s
test (ubuntu, 3.2)	18s
test (ubuntu, 3.3)	21s
test (ubuntu, 3.4)	24s
test (ubuntu, head)	16s
test (ubuntu, jruby)	54s
test (ubuntu, jruby-head)	53s
test (ubuntu, truffleruby)	28s
test (ubuntu, truffleruby-head)	35s
test (macos, 2.6)	44s
test (windows, 2.4.10)	2m 14s
finish	3s
	9m 26s

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