fix feature field typo

Author: albertstill

packages/react-scripts/config/webpack.config.demo.js

@@ -67,7 +67,7 @@ const postCSSLoaderOptions = {
  'Firefox ESR',
  'not ie < 9', // React doesn't support IE8 anyway
  ],
- feature: {
+ features: {
  autoprefixer: {
  flexbox: 'no-2009',
  },

packages/react-scripts/config/webpack.config.dev.js

@@ -43,7 +43,7 @@ const postCSSLoaderOptions = {
  'Firefox ESR',
  'not ie < 9', // React doesn't support IE8 anyway
  ],
- feature: {
+ features: {
  autoprefixer: {
  flexbox: 'no-2009',
  },

packages/react-scripts/config/webpack.config.library.js

@@ -62,7 +62,7 @@ const postCSSLoaderOptions = {
  'Firefox ESR',
  'not ie < 9', // React doesn't support IE8 anyway
  ],
- feature: {
+ features: {
  autoprefixer: {
  flexbox: 'no-2009',
  },