message: build: fix public-api:update gulp task
  PR makes the task faster but it doesn't work any more!
  Reverting to the slower but correct task for now.
diff: @@ -32,7 +32,7 @@ gulp.task('format', loadTask('format', 'format'));
  gulp.task('build.sh', loadTask('build', 'all'));
  gulp.task('build.sh:no-bundle', loadTask('build', 'no-bundle'));
  gulp.task('public-api:enforce', loadTask('public-api', 'enforce'));
  -gulp.task('public-api:update', ['build.sh:no-bundle'], loadTask('public-api', 'update'));
  +gulp.task('public-api:update', ['build.sh'], loadTask('public-api', 'update'));
  gulp.task('lint', ['format:enforce', 'validate-commit-messages', 'tslint']);
  gulp.task('tslint', ['tools:build'], loadTask('lint'));
  gulp.task('validate-commit-messages', loadTask('validate-commit-message'));
  