refactor(symbols): 重命名K线时长字段从period到bar

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yesterday aac24166b4e15146b0b4e18364cd1d154986f039

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package com.xcong.excoin.netty;
 
/**
 * @author wzy
 * @date 2019-05-06
 */
public interface ChatServer {
    void start() throws  Exception;
 
    void shutdown();
}