代码块标签不支持附加选项

[yunnysunny]

hexo官方支持使用一些附件选项来增强代码块的渲染，具体参见文档 https://hexo.io/docs/tag-plugins#Code-Block
不过经过我的尝试，在 next 主题中并没有得到支持。

{% codeblock listenInCluster lang:javascript line_number:true highlight:true mark:1,2,3%}
function listenInCluster(server, address, port, addressType,
                         backlog, fd, exclusive, flags) {
  exclusive = !!exclusive;

  if (cluster === undefined) cluster = require('cluster');

  if (cluster.isPrimary || exclusive) {
    // Will create a new handle
    // _listen2 sets up the listened handle, it is still named like this
    // to avoid breaking code that wraps this method
    server._listen2(address, port, addressType, backlog, fd, flags);
    return;
  }

  const serverQuery = {
    address: address,
    port: port,
    addressType: addressType,
    fd: fd,
    flags,
  };

  // Get the primary's server handle, and listen on it
  cluster._getServer(server, serverQuery, listenOnPrimaryHandle);

  function listenOnPrimaryHandle(err, handle) {
    err = checkBindError(err, port, handle);

    if (err) {
      const ex = exceptionWithHostPort(err, 'bind', address, port);
      return server.emit('error', ex);
    }
    
    // Reuse primary's server handle
    server._handle = handle;
    // _listen2 sets up the listened handle, it is still named like this
    // to avoid breaking code that wraps this method
    server._listen2(address, port, addressType, backlog, fd, flags);

  }
}
{% endcodeblock %}

以上代码本来想高亮前三行，结果发现并没有想要的效果。

使用官方默认主题时，选中的三行会有背景色突出效果：

[stevenjoezhang]

@yunnysunny 你对着这个 commit 改一下，看看效果怎么样 dafead3
没问题的话我 push 到 master 分支上