add exceptions for finished games

cmd/internal/statsapi/websocket.go

@@ -26,6 +26,11 @@ type Push struct {
 	UpdateId string
 }
 
+const (
+	GameFinalCode = 4200
+	GameUnavailableCode = 4400
+)
+
 type GamedayWebsocket struct {
 	baseURL url.URL
 	*websocket.Conn