Using outdated CSS Syntax for linear-gradient

[1stthomas]

While doing yarn run watch on a laravel project with this repo in use I get the following warning:

WARNING in ./node_modules/css-loader??ref--5-2!./node_modules/postcss-loader/lib??postcss!./node_modules/resolve-url-loader??ref--5-4!./node_modules/sass-loader/lib/loader.js??ref--5-5!./resources/sass/app.scss
(Emitted value instead of an instance of Error) autoprefixer: D:\work\hostings_other\laravel\postulate.admin.ch\resources\sass\node_modules\swiss-styleguide\src\assets\sass\chosen-theme.scss:261:3: Gradient has outdated direction syntax. New syntax is like `to left` instead of `right`.
 @ ./resources/sass/app.scss 4:14-254
 @ multi ./resources/js/app.js ./resources/sass/app.scss

[1stthomas]

Under the section "Contribution" you have the following sentence:

(...) Then, please make a Pull Request to the dev branch. (...)

Should I really do my pull request to a branch, that is 656 commits behind the master branch?

[gillerr]

Readme and dependencies will be updated with the Material Design Migration
Issue will be closed