fix broken link of "Test suite" in README #15

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Job	Run time	Billable time
rubocop	20s	0s
test (2.6)	21s	0s
test (2.7)	24s	0s
test (3.0)	11s	0s
test (3.1)	11s	0s
test (3.2)	16s	0s
test (3.3)	10s	0s
test (jruby-9.4)	55s	0s
test (truffleruby)	1m 50s	0s
	4m 38s	0s