Update readme.md

Author: hxfdarling

readme.md

@@ -2,13 +2,11 @@
 This is a webpack plugin that simplifies wrap HTML files to serve your webpack bundles. 
 Enhances html-webpack-plugin functionality by add `{before:"<!--before-->",after:"<!--after-->"}` option to allow you to wrap html content.
 ## install by npm
----
 ```npm
 npm i --save-dev HtmlWebpackPlugin HtmlWebpackWrapHtmlPlugin
 ```
 
 ## Basic usage
----
 Require the plugin in you webpack config:
 ```js
 var HtmlWebpackPlugin = require('HtmlWebpackPlugin');