message: preserve CSS comments when saving custom CSS
  Fixes
diff: -import {compile, serialize, stringify} from 'stylis';
  +import {COMMENT, compile, middleware, serialize, stringify} from 'stylis';
  const prettier = require('prettier/standalone');
  @@ -13,5 +13,15 @@ export function prettifyCss(cssString: string): string {
  export function minifyCss(cssString: string): string {
  console.log('compress', cssString);
  - return serialize(compile(cssString), stringify);
  + return serialize(
  + compile(cssString),
  + middleware([
  + (element) => {
  + if (element.type === COMMENT) {
  + return element.value;
  + }
  + },
  + stringify,
  + ])
  + );
  }
  