Use Fprint instead of Fprintf
@ -231,7 +231,7 @@ func (c BuildCommand) Run(args []string) int {
fmt.Fprintf(&message, "--> %s: ", name)
if artifact != nil {
fmt.Fprintf(&message, artifact.String())
fmt.Fprint(&message, artifact.String())
} else {
fmt.Fprint(&message, "<nothing>")
}