Add autofixer defaults.

See: facebook/create-react-app#345

Author: arunoda

dist/server/config/defaults/webpack.config.js

@@ -41,7 +41,9 @@ module.exports = function (storybookBaseConfig) {
   }]);
 
   newConfig.postcss = function () {
-    return [_autoprefixer2.default];
+    return [(0, _autoprefixer2.default)({
+      browsers: ['>1%', 'last 4 versions', 'Firefox ESR', 'not ie < 9']
+    })];
   };
 
   newConfig.resolve = {

src/server/config/defaults/webpack.config.js

@@ -40,7 +40,16 @@ module.exports = (storybookBaseConfig) => {
   ];
 
   newConfig.postcss = () => {
-    return [autoprefixer];
+    return [
+      autoprefixer({
+        browsers: [
+          '>1%',
+          'last 4 versions',
+          'Firefox ESR',
+          'not ie < 9',
+        ],
+      }),
+    ];
   };
 
   newConfig.resolve = {