message: fix gulpfile - block scoped declarations not supported
diff: @@ -26,7 +26,7 @@ gulp.task('tslint', function() {
  // prettier
  function runPrettier(command) {
  - let exec = require('child_process').exec;
  + var exec = require('child_process').exec;
  exec(command, function(err, stdout, stderr) {
  const files = stdout.split('\n');
  for (const file of files) {
  @@ -53,12 +53,11 @@ gulp.task('forceprettier', function() {
  // test
  gulp.task('test', function(cb) {
  - let spawn = require('child_process').spawn;
  -
  + var spawn = require('child_process').spawn;
  const dockerTag = 'vscodevim'
  console.log("Building container...")
  - let dockerBuildCmd = spawn('docker', ['build', '-f', './build/Dockerfile', '.', '-t', dockerTag], {
  + var dockerBuildCmd = spawn('docker', ['build', '-f', './build/Dockerfile', '.', '-t', dockerTag], {
  cwd : process.cwd(),
  stdio: 'inherit',
  });
  @@ -71,7 +70,7 @@ gulp.task('test', function(cb) {
  console.log("Running tests inside container...")
  console.log("To break, run `docker kill` in a separate terminal.")
  - let dockerRunCmd = spawn('docker', ['run', '-v', process.cwd() + ':/app', dockerTag], {
  + var dockerRunCmd = spawn('docker', ['run', '-v', process.cwd() + ':/app', dockerTag], {
  cwd : process.cwd(),
  stdio: 'inherit',
  });
  