add async writes to broadcast

hub.go

@@ -31,10 +31,10 @@ func (h *hub) run() {
 			for s := range h.sessions {
 				if m.filter != nil {
 					if m.filter(s) {
-						s.writeMessage(m)
+						go s.writeMessage(m)
 					}
 				} else {
-					s.writeMessage(m)
+					go s.writeMessage(m)
 				}
 			}
 		}

melody_test.go

@@ -167,7 +167,6 @@ func TestUpgrader(t *testing.T) {
 	}
 }
 
-/*
 func TestBroadcast(t *testing.T) {
 	broadcast := NewTestServer()
 	broadcast.m.HandleMessage(func(session *Session, msg []byte) {
@@ -212,7 +211,6 @@ func TestBroadcast(t *testing.T) {
 		t.Error(err)
 	}
 }
-*/
 
 func TestBroadcastOthers(t *testing.T) {
 	broadcast := NewTestServer()