enhance CHANGELOG.md (#1170)

Author: tonytonyjan

CHANGELOG.md

@@ -151,7 +151,7 @@ files.
 const sassLoader = environment.loaders.get('sass')
 const cssLoader = sassLoader.use.find(loader => loader.loader === 'css-loader')
 
-cssLoader.options = Object.assign(cssLoader.options, {
+cssLoader.options = Object.assign({}, cssLoader.options, {
   modules: true,
   localIdentName: '[path][name]__[local]--[hash:base64:5]'
 })