Trigger onError callback when connection fails #39
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Hi, I have met the following case. I am using access token to connect to websocket server. It's lifetime is about 20 minutes. As soon as token expires,
PhoenixSocket
tries to reconnect and receives 401 errors. This pull request proposes a way to intercept errors during connection process. By triggering an error, I can destroy old connection and instantiate a new one with a new access token