Bump gulp from 4.0.0 to 4.0.2

Bumps [gulp](https://github.com/gulpjs/gulp) from 4.0.0 to 4.0.2.
- [Release notes](https://github.com/gulpjs/gulp/releases)
- [Changelog](https://github.com/gulpjs/gulp/blob/master/CHANGELOG.md)
- [Commits](gulpjs/gulp@v4.0.0...v4.0.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -2,7 +2,7 @@
     "devDependencies": {
         "autoprefixer": "6.3.6",
         "cssnano": "^4.1.10",
-        "gulp": "^4.0.0",
+        "gulp": "^4.0.2",
         "gulp-livereload": "^4.0.1",
         "gulp-nodemon": "^2.4.2",
         "gulp-postcss": "6.1.1",