message: Fix gzip some more
diff: -const execFile = require("child_process").execFile;
  +const child_process = require("child_process");
  const fs = require("fs");
  module.exports = function(grunt) {
  @@ -124,18 +124,19 @@ module.exports = function(grunt) {
  const promises = [];
  this.filesSrc.forEach(function(file) {
  promises.push(new Promise(function(resolve, reject) {
  - execFile("gzip", ["--best", "-k", "--no-name", file], function(error, stdout, stderr) {
  - grunt.log.writeln("gzip " + file + " => " + stdout + stderr);
  + child_process.exec("gzip -c --no-name " + file + " > " + file + ".gz", function(error, stdout, stderr) {
  if (error) {
  + grunt.log.writeln("gzip " + file + " => error: " + stdout + stderr);
  reject(error);
  } else {
  + grunt.log.writeln("gzip " + file + " => success");
  resolve();
  }
  });
  }));
  promises.push(new Promise(function(resolve, reject) {
  - execFile("brotli/out/bin/bin/bro", ["--quality", "9", "--input", file, "--output", file + ".br"], function(error, stdout, stderr) {
  + child_process.execFile("brotli/out/bin/bin/bro", ["--quality", "9", "--input", file, "--output", file + ".br"], function(error, stdout, stderr) {
  if (error) {
  grunt.log.writeln("brotli " + file + " => error: " + stdout + stderr);
  reject(error);
  