readme: add description of --no behaviour #118

Job	Run time
tests / build	14s
tests / matrix	14s
tests / latest minors (9.11)	2m 21s
tests / latest minors (8.17)	2m 20s
tests / latest minors (7.10)	2m 16s
tests / latest minors (6.17)	2m 23s
tests / latest minors (5.12)	2m 17s
tests / latest minors (4.9)	3m 9s
tests / latest minors (3.3)	2m 16s
tests / latest minors (2.5)	2m 11s
tests / latest minors (1.8)	2m 21s
tests / latest minors (0.12)	2m 22s
tests / latest minors (0.10)	2m 22s
tests / latest minors (0.8)	2m 17s
tests / non-latest minors	0s
tests / node ${{ inputs.type }} @ ${{ inputs.range }}	0s
node < 10	0s
	29m 3s

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