When use in language : zh-CN, connection.rb should do code translate

[kiddy818]

change "send_data_to_socket(packet.to_json)" to "send_data_to_socket(JSON.iconv("GBK", "UTF-8", packet.to_json))"
and
change "DataPacket.parse(raw_response)" to DataPacket.parse(JSON.iconv("UTF-8", "GBK", raw_response))"