Unreachable code in semaphore.md

[Tommaso Stocchi]

In the semaphore pattern, the Release func has an unreachable return statement:

func (s *implementation) Release() error {
	select {
	case _ = <-s.sem:
		return nil
	case <-time.After(s.timeout):
		return ErrIllegalRelease
	}

	return nil
}

The last return nil will never be reached.

[Edward]

fixed in #5