scss-lint developers suggest using new linter

Because Ruby Sass is [being deprecated](https://sass-lang.com/ruby-sass), and the developers [suggest](https://github.com/brigade/scss-lint#notice-consider-other-tools-before-adopting-scss-lint) moving to stylelint or sass-lint. It would be great to include one or both of these linters since projects are likely to slowly move away from scss-lint.