OKEX v5 need to add

https://www.okx.com/docs-v5/en/#overview

new wss path and new arguments

```javascript
// format 
{
  "op": "subscribe",
  "args": ["<SubscriptionTopic>"]
}
// example
{
  "op": "subscribe",
  "args": [
    {
      "channel": "trades",
      "instId": "BTC-USDT"
    }
  ]
}
```

v3 doesn't work 