This is my gulp build.

Inside:

• "del": "6.0.0",

• "gulp": "4.0.2",

• "gulp-autoprefixer": "8.0.0",

• "gulp-cssbeautify": "3.0.1",

• "gulp-cssnano": "2.1.3",

• "gulp-imagemin": "7.1.0",

• "gulp-notify": "4.0.0",

• "gulp-plumber": "1.2.1",

• "gulp-rename": "2.0.0",

• "gulp-rigger": "0.5.8",

• "gulp-sass": "5.1.0",

• "gulp-strip-css-comments": "2.0.0",

• "gulp-uglify": "3.0.2",

• "panini": "1.7.2",

• "sass": "1.58.1"

  To use this - just copy the files to your project folder on your computer and run in the terminal: npm i.