README: Link to try-it #88

Job	Run time
Code tests	9m 16s
Documentation tests	8m 22s
Client tests (1.20.x, ubuntu-latest)	1m 11s
System tests (1.20.x, cluster, dir)	11m 32s
Client tests (1.20.x, macos-latest)	49s
System tests (1.20.x, cluster, btrfs)	12m 11s
Client tests (1.20.x, windows-latest)	3m 14s
System tests (1.20.x, cluster, lvm)	14m 9s
System tests (1.20.x, cluster, zfs)	13m 48s
System tests (1.20.x, cluster, ceph)	17m 54s
System tests (1.20.x, cluster, random)	14m 46s
System tests (1.20.x, standalone, dir)	21m 43s
System tests (1.20.x, standalone, btrfs)	24m 24s
System tests (1.20.x, standalone, lvm)	39m 31s
System tests (1.20.x, standalone, zfs)	38m 50s
System tests (1.20.x, standalone, ceph)	1h 15m 41s
System tests (1.20.x, standalone, random)	24m 32s
System tests (stable, cluster, dir)	11m 41s
System tests (stable, standalone, dir)	21m 32s
System tests (tip, cluster, dir)	15m 23s
System tests (tip, standalone, dir)	23m 15s
	6h 43m 44s

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