fix: use postcss-scss as parser

...instead of `syntax`.

This way comments actually get properly detected and transformed to `/* comment */`.

lib/clark-plugin.js

@@ -117,7 +117,7 @@ module.exports = class ClarkPlugin extends Plugin {
       postcssOptions: {
         // https://github.com/postcss/postcss-scss
         // This allows you to use inline comments, like this one here.
-        syntax: require('postcss-scss')
+        parser: require('postcss-scss')
       }
     };
   }