Ruby

update readme #511

Job	Run time
test_matrix (ubuntu, 2.5)	23s
test_matrix (ubuntu, 2.6)	26s
test_matrix (ubuntu, 2.7)	27s
test_matrix (ubuntu, 3.0)	13s
test_matrix (ubuntu, 3.1)	14s
test_matrix (ubuntu, 3.2)	13s
test_matrix (ubuntu, 3.3)	16s
test_matrix (ubuntu, head)	13s
test_matrix (ubuntu, truffleruby)	41s
test_matrix (ubuntu, truffleruby-head)	55s
test_matrix (ubuntu, jruby)	52s
test_matrix (ubuntu, jruby-head)	52s
test_matrix (macos, 2.5)	6s
test_matrix (macos, 2.6)	34s
test_matrix (macos, 2.7)	31s
test_matrix (macos, 3.0)	16s
test_matrix (macos, 3.1)	16s
test_matrix (macos, 3.2)	20s
test_matrix (macos, 3.3)	19s
test_matrix (macos, head)	16s
test_matrix (macos, truffleruby)	54s
test_matrix (macos, truffleruby-head)	1m 2s
test_matrix (macos, jruby)	55s
test_matrix (macos, jruby-head)	48s
finish	0s
	12m 2s

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