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Update README to clarify the detection heuristic #24

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Run time

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Job	Run time
2.7	24s
3.0	10s
3.1	7s
3.2	7s
head	12s
jruby	29s
jruby-head	32s
truffleruby	23s
truffleruby-head	26s
	2m 50s