Update guides `README` -> `readme`. #18

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Job	Run time
3.0 on ubuntu	10s
3.1 on ubuntu	12s
3.2 on ubuntu	11s
3.0 on macos	15s
3.1 on macos	10s
3.2 on macos	15s
truffleruby on ubuntu	2m 34s
jruby on ubuntu	2m 59s
head on ubuntu	2m 20s
	9m 6s