Merge pull request #87 from etagwerker/feature/more-rubies #12

Job	Run time
test (ubuntu, 2.7)	25s
test (ubuntu, 3.0)	11s
test (ubuntu, 3.1)	10s
test (ubuntu, 3.2)	14s
test (ubuntu, 3.3)	15s
test (ubuntu, truffleruby)	37s
test (ubuntu, truffleruby-head)	39s
test (macos, 2.7)	50s
test (macos, 3.0)	21s
test (macos, 3.1)	20s
test (macos, 3.2)	21s
test (macos, 3.3)	35s
test (macos, truffleruby)	1m 18s
test (macos, truffleruby-head)	1m 2s
	7m 18s

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