Replace Autoprefixer browsers option to Browserslist config

[Andric LibreSinn]

Errors popping up on yarn start/npm run start

Replace Autoprefixer browsers option to Browserslist config.
  Use browserslist key in package.json or .browserslistrc file.

  Using browsers option cause some error. Browserslist config
  can be used for Babel, Autoprefixer, postcss-normalize and other tools.

  If you really need to use option, rename it to overrideBrowserslist.

  Learn more at:
  https://github.com/browserslist/browserslist#readme
  https://twitter.com/browserslist

[Tyler Wagner]

@mrpotatoes, I included it in my PR. Once it gets merged in, you might still need to edit the browser list you want to support.