Test qlib from source slow

Update README.md (#1637) #1260

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Run time

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Job	Run time
build (windows-latest, 3.7)	25m 42s
build (windows-latest, 3.8)	23m 28s
build (ubuntu-20.04, 3.7)	15m 40s
build (ubuntu-20.04, 3.8)	14m 16s
build (ubuntu-22.04, 3.7)	16m 20s
build (ubuntu-22.04, 3.8)	30m 53s
build (macos-11, 3.7)	53m 20s
build (macos-11, 3.8)	39m 6s
build (macos-latest, 3.7)	29m 39s
build (macos-latest, 3.8)	21m 20s
	4h 29m 44s