Ranges over channel instead of using select

Signed-off-by: Warren Fernandes <warren.f.fernandes@gmail.com>

eventer.go

@@ -129,16 +129,13 @@ func (e *eventer) Once(n string, f func(s interface{})) (err error) {
 	out := e.Subscribe()
 	go func() {
 	ProcessEvents:
-		for {
-			select {
-			case evt := <-out:
+		for evt := range out {
 			if evt.Name == n {
 				f(evt.Data)
 				e.Unsubscribe(out)
 				break ProcessEvents
 			}
 		}
-		}
 	}()
 
 	return