bump docker/go-units v0.4.0

relevant changes:

- docker/go-units#19 make 1 second not to be plural seconds
- docker/go-units#20 Add `HumanSizeWithPrecision` function
- docker/go-units#21 change week display rule
- docker/go-units#22 Better human duration precision
- docker/go-units#23 Removes spaces before unit
- docker/go-units#27 Fix #26 - RAMInBytes Bug
- docker/go-units#33 Fix handling of unlimited (-1) ulimit values
- docker/go-units#34 Revert 46 minute threshold

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/docker/go-units/ulimit.go

@@ -96,8 +96,13 @@ func ParseUlimit(val string) (*Ulimit, error) {
 		return nil, fmt.Errorf("too many limit value arguments - %s, can only have up to two, `soft[:hard]`", parts[1])
 	}
 
-	if soft > *hard {
-		return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: %d > %d", soft, *hard)
+	if *hard != -1 {
+		if soft == -1 {
+			return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: soft: -1 (unlimited), hard: %d", *hard)
+		}
+		if soft > *hard {
+			return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: %d > %d", soft, *hard)
+		}
 	}
 
 	return &Ulimit{Name: parts[0], Soft: soft, Hard: *hard}, nil