Update postcss.md (vuejs#282)

sysashi · yyx990803 · commit f7ed5f575d8c · 2016-07-11T18:22:14.000-04:00
Minor typo
diff --git a/docs/en/features/postcss.md b/docs/en/features/postcss.md
@@ -32,7 +32,7 @@ module.exports = {
 
 ### Using Custom PostCSS Plugins
 
-To use custom PostCSS pugins, pass an array to the `postcss` option under the `vue` section. Example using [CSSNext](http://cssnext.io/):
+To use custom PostCSS plugins, pass an array to the `postcss` option under the `vue` section. Example using [CSSNext](http://cssnext.io/):
 
 ``` js
 // webpack.config.js
