Fix "found orphan CR, try removeCR option"

Error: resolve-url-loader: CSS error
  source-map information is not available at url() declaration (found orphan CR, try removeCR option)

see: bholloway/resolve-url-loader#107

Author: diegocardoso93

lib/loaders/sass.js

@@ -31,7 +31,8 @@ module.exports = {
             sassLoaders.push({
                 loader: 'resolve-url-loader',
                 options: {
-                    sourceMap: webpackConfig.useSourceMaps
+                    sourceMap: webpackConfig.useSourceMaps,
+                    removeCR: true
                 }
             });
         }