Don't pass removed minimize option to CSS Loader

[ocean90]

The option has been removed in version 1.0, see webpack-contrib/css-loader@965068d.

Fixes #286.

[timneutkens]

Should a minimizer be implemented?

[kylemh]

It appears as though the css-loader author encourages you to leverage cssnano via postcss or webpack to minify:

https://github.com/webpack-contrib/css-loader/releases/tag/v1.0.0

[eeyang92]

Hi, I'm using @zeit/next-less and I'm running into an issue where even the presence of minimized: false triggers an exception:

./node_modules/antd/lib/input/style/index.less
Module build failed (from ./node_modules/@zeit/next-css/node_modules/mini-css-extract-plugin/dist/loader.js):
ModuleBuildError: Module build failed (from ./node_modules/css-loader/dist/cjs.js):
ValidationError: CSS Loader Invalid Options

options should NOT have additional properties

I verified this by manually deleting the property from the webpack config:

webpack(config, options) {
    if (!options.isServer) {
      delete config.module.rules[config.module.rules.length - 1].use[2].options.minimize
    }
    return config
}

I've tried setting cssLoaderOptions but it doesn't seem to have any effect.

It looks like this may have been fixed for next-css, but not next-less?