enableLessLoader(lessLoaderOptionsCallback = () => {}) {
        webpackConfig.enableLessLoader(lessLoaderOptionsCallback);

        return this;
    }
Call this if you plan on loading less files.

```
Encore.enableLessLoader();
```

Or pass options to the loader

```
Encore.enableLessLoader(function(options) {
    // https://github.com/webpack-contrib/less-loader#examples
    // http://lesscss.org/usage/#command-line-usage-options
    // options.relativeUrls = false;
});
```

@param {OptionsCallback<object>} lessLoaderOptionsCallback
@returns {Encore}