worker: use spaces in err message
@@ -22,7 +22,7 @@ var (
// ErrGracePeriodTimeout indicates that the grace period for a graceful
// termination has been reached.
//
- ErrGracePeriodTimeout = errors.New("grace-period-timeout")
+ ErrGracePeriodTimeout = errors.New("grace period timeout")
// ErrNotImplemented indicates that a method is not implemented.
//
