update usages in README based on current b2 --help output
#1355
| Job | Run time |
|---|---|
| 41s | |
| 31s | |
| 30s | |
| 9m 19s | |
| 11m 38s | |
| 10m 41s | |
| 13m 5s | |
| 10m 12s | |
| 5m 5s | |
| 5m 1s | |
| 5m 7s | |
| 4m 36s | |
| 16m 11s | |
| 14m 54s | |
| 31m 52s | |
| 2m 45s | |
| 2m 40s | |
| 9m 42s | |
| 9m 11s | |
| 8m 50s | |
| 5m 12s | |
| 5m 18s | |
| 5m 39s | |
| 5m 51s | |
| 13m 40s | |
| 20m 41s | |
| 14m 8s | |
| 5m 20s | |
| 5m 8s | |
| 56s | |
| 4h 14m 24s |