The error-message changed in newer versions, and no longer includes
"exactly".
This patch adjusts the test in the meantime.
59.13 === FAIL: cli/command/volume TestUpdateCmd (0.00s)
59.13 update_test.go:21: assertion failed: expected error to contain "requires 1 argument", got "\"update\" requires exactly 1 argument.\nSee 'update --help'.\n\nUsage: update [OPTIONS] [VOLUME] [flags]\n\nUpdate a volume (cluster volumes only)"
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>