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Update the usage example #57

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Run time

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Job	Run time
test-macos (accelerate)	15s
check	14s
test-ubuntu (blis)	2m 15s
test-macos (blis)	1m 4s
test-macos (intel-mkl)	40s
test-ubuntu (intel-mkl)	43s
test-macos (netlib)	3m 15s
test-ubuntu (netlib)	1m 52s
test-macos (openblas)	6m 8s
test-ubuntu (openblas)	5m 47s
	22m 13s