Fix linting issues in PostCSS config

postcss.config.js

@@ -2,10 +2,10 @@ const postcssPresetEnv = require('postcss-preset-env');
 const cssnano = require('cssnano');
 
 const config = () => ({
-  plugins: [
-    postcssPresetEnv(),
-    cssnano()
-  ]
+    plugins: [
+        postcssPresetEnv(),
+        cssnano()
+    ]
 });
 
-module.exports = config
+module.exports = config;