Ruby

update README #508

Job	Run time
test_matrix (ubuntu, 2.5)	22s
test_matrix (ubuntu, 2.6)	27s
test_matrix (ubuntu, 2.7)	26s
test_matrix (ubuntu, 3.0)	14s
test_matrix (ubuntu, 3.1)	15s
test_matrix (ubuntu, 3.2)	15s
test_matrix (ubuntu, 3.3)	13s
test_matrix (ubuntu, head)	14s
test_matrix (ubuntu, truffleruby)	40s
test_matrix (ubuntu, truffleruby-head)	50s
test_matrix (ubuntu, jruby)	51s
test_matrix (ubuntu, jruby-head)	51s
test_matrix (macos, 2.5)	4s
test_matrix (macos, 2.6)	42s
test_matrix (macos, 2.7)	39s
test_matrix (macos, 3.0)	23s
test_matrix (macos, 3.1)	27s
test_matrix (macos, 3.2)	24s
test_matrix (macos, 3.3)	19s
test_matrix (macos, head)	25s
test_matrix (macos, truffleruby)	44s
test_matrix (macos, truffleruby-head)	58s
test_matrix (macos, jruby)	40s
test_matrix (macos, jruby-head)	44s
finish	0s
	12m 7s

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