Tweak README #373

Job	Run time
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, v1.14, true, true)	1m 8s
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, v1.14, true, false)	1m 16s
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, v1.14, false, true)	1m 17s
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, v1.14, false, false)	1m 3s
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, true, true)	47s
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, true, false)	32s
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, false, true)	38s
Test option hexpm-mirrors with a dummy first mirror (ubuntu-22.04, 24, false, false)	33s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, v1.14, true, true)	1m 10s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, v1.14, true, false)	1m 12s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, v1.14, false, true)	1m 4s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, v1.14, false, false)	1m 3s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, true, true)	30s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, true, false)	29s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, false, true)	28s
Test option hexpm-mirrors with a dummy first mirror (windows-2022, 24, false, false)	31s
	13m 41s

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