Update README.md #20

Job	Run time
Code tests	10m 32s
Documentation tests	8m 29s
Client tests (1.18.x, ubuntu-latest)	26s
Client tests (1.18.x, macos-latest)	46s
Client tests (1.18.x, windows-latest)	1m 34s
System tests (1.18.x, cluster, dir)	14m 51s
System tests (1.18.x, cluster, btrfs)	14m 1s
System tests (1.18.x, cluster, lvm)	14m 14s
System tests (1.18.x, cluster, zfs)	14m 1s
System tests (1.18.x, cluster, ceph)	17m 27s
System tests (1.18.x, cluster, random)	15m 47s
System tests (1.18.x, standalone, dir)	26m 21s
System tests (1.18.x, standalone, btrfs)	21m 40s
System tests (1.18.x, standalone, lvm)	41m 53s
System tests (1.18.x, standalone, zfs)	40m 25s
System tests (1.18.x, standalone, ceph)	1h 18m 6s
System tests (1.18.x, standalone, random)	32m 24s
System tests (stable, cluster, dir)	13m 0s
System tests (stable, standalone, dir)	21m 14s
System tests (tip, cluster, dir)	14m 26s
System tests (tip, standalone, dir)	22m 33s
	7h 4m 10s

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