message: Update gruntfile brotli
diff: @@ -187,16 +187,8 @@ module.exports = function(grunt) {
  });
  }));
  - let brotli;
  - let brotliArgs;
  -
  - if (process.env.BROTLI) {
  - brotli = process.env.BROTLI;
  - brotliArgs = ["--quality", "9", "--input", file, "--output", file + ".br"];
  - } else {
  - brotli = 'brotli/brotli';
  - brotliArgs = [file];
  - }
  + const brotli = process.env.BROTLI || 'brotli/brotli';
  + const brotliArgs = [file];
  promises.push(new Promise(function(resolve, reject) {
  child_process.execFile(brotli, brotliArgs, function(error, stdout, stderr) {
  