constructor(options) {
    super(options);

    // TODO: Remove webpack-log
    this.logger = log({
      name: 'Critters',
      unique: true,
      level: this.options.logLevel
    });
  }
Create a Critters plugin instance with the given options.
@public
@param {Options} options Options to control how Critters inlines CSS. See https://github.com/GoogleChromeLabs/critters#usage
@example
// webpack.config.js
module.exports = {
  plugins: [
    new Critters({
      // Outputs: <link rel="preload" onload="this.rel='stylesheet'">
      preload: 'swap',

      // Don't inline critical font-face rules, but preload the font URLs:
      preloadFonts: true
    })
  ]
}