message: change var -> let,const
diff: @@ -180,7 +180,7 @@ export class RavenCommandResponsePipeline<TStreamResult> extends EventEmitter {
  callback();
  },
  flush(callback) {
  - var str = null;
  + let str = null;
  try {
  str = Buffer.concat(bytesChunks).toString('utf-8');
  } catch(err){
  