Update index.js
Update index.js

bug fix: buffer.js:309
    throw new TypeError('"list" argument must be an Array of Buffers');
    ^

TypeError: "list" argument must be an Array of Buffers
    at Function.Buffer.concat (buffer.js:309:11)
    at ReadStream.<anonymous> (/root/utils/node_modules/nginxparser/index.js:100:29)
    at emitOne (events.js:96:13)
    at ReadStream.emit (events.js:189:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at ReadStream.Readable.push (_stream_readable.js:134:10)
    at onread (fs.js:1925:12)
    at FSReqWrap.wrapper [as oncomplete] (fs.js:627:17)
chriso/nginx_parser,chriso/nginx-parser