websocketDidDisconnect(socket:error:) prints lots logs

[ananfang]

If the device disconnected from the WebSocket, the delegate will trigger func websocketDidDisconnect(socket:error:), and print lots of logs by:
print("error: \(error)")

It is not ideal for release build, so this pull request adds a property "shouldPrintWebSocketLog" for class Client. By default this value is true, and you can turn the logs off by setting it false.

Here is my pull request about this issue.

[flovilmart]

Thanks for the PR! Closing as resolved!

[ananfang]

Thanks for @flovilmart review!

[flovilmart]

sorry it took forever!